Katra Bus Tickets: Bus Booking from & To Katra | zingbus

Book Bus Tickets to and from Katra

Katra bus booking on zingbus connects this pilgrimage town at the foothills of the Trikuta Mountains in Reasi district, Jammu and Kashmir, to Delhi, Gurgaon, Delhi Airport, Jaipur, Chandigarh, Sonipat, Karnal, Amritsar, Pathankot, and Jammu with daily AC services on the NH 44 corridor and the Jammu valley road network.

Located at an elevation of approximately 760 metres and serving as the base camp for the Shri Mata Vaishno Devi shrine, Katra is one of India’s most visited pilgrimage towns, drawing millions of devotees annually from across North India and beyond. The town sits 42 km north of Jammu and is the mandatory departure point for the 13 km trekking route to the Vaishno Devi Bhawan. Katra is also the eastern terminus of the Udhampur-Srinagar-Baramulla Rail Link and has a dedicated railway station.

Katra bus booking on zingbus is available on premium AC coach categories including Bharat Benz AC Sleeper/Seater with onboard washroom and Tata A/C Sleeper coaches, with GPS tracking active on all corridors, trained marshals on every trip, and verified drivers experienced on the NH 44 and Jammu valley approach roads.

For pilgrimage groups, family convoys to Vaishno Devi, or corporate travel from Katra, zingbus provides bus rental services that can be arranged for any group size or route requirement, with dedicated coordinator support for Vaishno Devi yatra groups.

Why Choose zingbus for Your Katra Bus Travel?

  • Live GPS Tracking: Every zingbus coach on the Katra corridor is tracked in real time via the zingbus app, so you and your family can monitor bus location and ETA before and during the journey.
  • Safety First:
    • CCTV, FDSS fire suppression, fire retardant interiors, and 10 kg extinguishers on every coach.
    • AIS 119 compliant with 4 exits: emergency door, 2 roof hatches, side exit.
    • Window hammers are placed at each berth. Collapsible steps are fitted on the side exit door.
    • Safety exits are visible on the seat map before you book.
  • Verified Crew: Professional drivers and trained marshals experienced on NH 44, Jammu, and the Katra mountain approach are on board every trip.
  • On Time Guarantee: You receive a 50% refund coupon if your bus is delayed by 45 or more minutes on any Katra corridor route.
  • Female Friendly: Women only seating is available on select routes. Solo female pilgrims and women travelling to Vaishno Devi can book women only seats at checkout on all Katra corridor buses.
  • 24/7 Support: WhatsApp assistance is available at +91 82870 09889 before, during, or after your journey to Katra.
  • Premium Lounges: The zingbus Premium Lounge at ISBT Kashmere Gate, Delhi, is available to passengers departing on Delhi to Katra overnight services. Check the zingbus app for lounge availability at your departure point.

Types of Buses Available for Katra Travel

Bus TypeBest ForAmenities
Bharat Benz AC Sleeper/Seater (With Washroom)Long-distance overnight Delhi NCR to Katra corridorAC, berths/reclining seats, onboard washroom, charging ports, water bottle, blanket
Tata A/C Sleeper (36 Seats)Delhi and Chandigarh overnight corridorsAC, 36 sleeper berths, charging ports, water bottle, blanket
AC Seater/SleeperShorter corridors including Pathankot, Jammu, and AmritsarAC, reclining seats or berths, charging ports, water bottle, blanket

Explore All the Verticals of zingbus

zingbus offers diverse coach categories tailored for different travel preferences:

  1. zingbus Plus: Premium coaches with more legroom, priority boarding, and upgraded amenities.
  2. zingbus Maxx: Seven star luxury fleet featuring airline style seating and exceptional onboard service.
  3. ValueBus: Budget friendly option with reliable service and essential comfort.
  4. zingbus Electric (EV): Sustainable travel with zero emissions and modern amenities.

Whether you prioritise luxury or budget, zingbus ensures a high quality travel experience across all coach categories.

Popular Boarding and Dropping Points in Katra

Boarding Points

  • Ashiya Chauraha Durga Parking: This is the primary zingbus boarding and dropping point in Katra, located at Ashiya Chauraha near the Durga Parking area in the central part of the town, within walking distance of the main market and most pilgrim accommodations, accessible by auto in 5 to 10 minutes from the railway station.
  • Katra Bus Stand: The central bus stand in Katra town serves as a secondary stop for intercity services and is the main departure point for Jammu and Pathankot direction passengers. Check the zingbus app at the time of booking for the confirmed stop on your specific service.

Dropping Points

  • Ashiya Chauraha Durga Parking: Inbound passengers arriving from Delhi, Gurgaon, Chandigarh, Jaipur, and other Delhi NCR corridors are dropped at Ashiya Chauraha Durga Parking, which is centrally located for onward access to pilgrim dharamshalas, hotels, and the yatra registration counter.
  • Katra Bus Stand: For passengers arriving on Jammu-originating and Pathankot-originating services, the Katra Bus Stand area serves as the confirmed dropping zone. Check the zingbus app while booking for the confirmed drop pin on your route.

For other bus stops, refer to the booking page of the respective route you are looking for on the zingbus app or website.

Door to Door Pickup & Drop

zingbus offers door-to-door cab service in select cities, making your journey smoother from start to finish. You can get picked up from your doorstep to your boarding point, or book a drop from your arrival point to your destination.

Service availability depends on the city and route. Check the zingbus app or website while booking.

Katra Bus Routes and Duration

RouteDistanceDurationBus Types Available
Delhi to Katra~658 km~12hBharat Benz AC Sleeper/Seater (Washroom), Tata A/C Sleeper 36 Seats
Katra to Delhi~658 km~8h 45mBharat Benz AC Sleeper/Seater (Washroom), AC Seater/Sleeper
Gurgaon to Katra~660 km~11hAC Sleeper/Seater
Delhi Airport to Katra~655 km~11hAC Sleeper/Seater
Sonipat to Katra~597 km~7h 33mAC Sleeper/Seater
Karnal to Katra~529 km~6h 46mAC Sleeper/Seater
Chandigarh to Katra~393 km~5h 13mAC Sleeper/Seater
Jaipur to Katra~1000 km~16h+AC Sleeper/Seater
Katra to Jammu~41 km~35mAC Seater/Sleeper

Note: Durations and distances are approximate and may vary based on traffic, weather, and road conditions. For confirmed pricing and real time seat availability, check the zingbus app or website.

Best Time to Visit Katra

March to May | 15 to 28 degrees C

The spring season is one of the most popular periods for the Vaishno Devi yatra, with comfortable trekking temperatures and clear mountain skies. Navratri in March and April drives the highest bus booking demand on every Katra corridor, and pilgrims, families, and solo devotees should book 2 to 3 weeks ahead during this window.

June to August | 18 to 32 degrees C

Summer in Katra is mild compared to the plains, making it a popular relief destination for families from Delhi, Gurgaon, and Rajasthan looking to combine the yatra with a hill break. The Trikuta foothills remain lush green during the pre-monsoon months, and the yatra path to Bhawan sees high footfall from school holiday travellers.

September to October | 12 to 26 degrees C

The post-monsoon period brings cool, crisp air to Katra and clear views of the Trikuta range. Shardiya Navratri in October is the second major peak pilgrimage period of the year, drawing millions of devotees on the Delhi NCR overnight corridor and making October the single busiest month for Katra bus travel.

November to February | 2 to 16 degrees C

Winter temperatures on the Vaishno Devi trekking route can drop sharply, with occasional snowfall above the Bhawan. Pilgrims and photographers visiting for the snow-dusted shrine experience should carry warm layers. Bus frequencies remain normal, and the winter season sees steady demand from Rajasthan travellers seeking the Vaishno Devi experience in the cooler months.

What to Expect on the Katra Bus Journey

Katra sits at the northern end of NH 44, approximately 658 km from Delhi, making the overnight bus the most practical and popular way for North Indian pilgrims to reach the Vaishno Devi base camp.

  • Delhi to Katra corridor: The approximately 658 km route takes approximately 12 hours, with 3 daily buses departing between 7:00 PM and 9:35 PM from Delhi, arriving at Katra in the early morning hours in time for yatra registration.
  • Washroom coaches on overnight service: Bharat Benz AC Sleeper/Seater coaches with onboard washrooms operate on the Delhi corridor, making the long overnight journey significantly more comfortable for elderly pilgrims and families.
  • Chandigarh and Sonipat corridors: These routes cover 393 km and 597 km respectively and arrive at Katra in the morning, allowing pilgrims from Punjab and Haryana to board late night services and reach the yatra start point before sunrise darshan slots.
  • Katra to Jammu short hop: The 41 km return route to Jammu takes approximately 35 minutes with 3 daily buses, convenient for pilgrims who need to connect to Jammu Railway Station or Jammu Airport after completing the yatra.
  • Mountain approach from Jammu: The final 42 km road stretch from Jammu to Katra winds through the Shivalik foothills, with a gradual altitude gain that is visible from the bus on daylight services.

All coaches include AC, berths or reclining seats, water bottles, blankets, and charging ports throughout the journey.

Pro Tips for Katra Bus Travel

zingbus operates to and from Katra across Delhi NCR, Haryana, Chandigarh, Punjab, Rajasthan, and Jammu corridors with daily AC services. Here are the key essentials:

  • Advance Booking During Navratri: Both Navratri windows (March to April and October) are the peak demand periods on every Katra corridor bus. Seats on the Delhi, Gurgaon, and Chandigarh overnight services fill up 2 to 3 weeks ahead during Navratri, so book early.
  • Departure Timing for Yatra: Delhi to Katra overnight buses depart between 7:00 PM and 9:35 PM and arrive at Katra by early morning, which aligns well with the Vaishno Devi yatra registration window that opens at 6 AM. Plan your arrival accordingly.
  • Warm Clothing Even in Summer: The Vaishno Devi trekking path sits between 1,560 and 5,200 metres in altitude. Even if Katra town is warm, the Bhawan and Bhairo Baba temple are significantly colder. Carry a jacket regardless of the season.
  • Mobile Network on the Route: Network connectivity is strong on NH 44 up to Jammu but can be intermittent through the Katra approach and on the trekking path. Download your zingbus m-ticket and offline maps before departure from Delhi.
  • Jammu Connection for Return Travel: If your return bus is from Jammu rather than Katra, the 3 daily Katra to Jammu zingbus services take approximately 35 minutes and connect you to Jammu bus stand, railway station, and airport.
  • Luggage at Katra Base: Katra has multiple cloak room facilities near the Shrine Board registration counter where you can deposit heavy luggage before starting the trek. Travel light on the yatra path.

These preparations ensure your pilgrimage journey from Katra is smooth and well planned.

Why Katra Over Other Pilgrimage Destinations?

Katra stands apart from other major North Indian pilgrimage towns because of its combination of a supreme Shakti Peeths, a modern mountain infrastructure, and the strongest overnight bus connectivity from Delhi NCR in the entire J&K circuit.

  • India’s Most Visited Shakti Peeths: The Shri Mata Vaishno Devi shrine is the most visited pilgrimage site in India after Tirupati, drawing over 8 million devotees annually. No other J&K destination has this volume of religious footfall.
  • Modern Shrine Infrastructure: The Vaishno Devi Shrine Board maintains the entire 13 km yatra track with rest points, medical facilities, RFID-based pilgrim tracking, and round-the-clock security, making it one of India’s most systematically managed pilgrimage routes.
  • Cooler Climate Than Plains Pilgrimage Towns: At 760 metres, Katra stays 8 to 12 degrees cooler than Delhi year round, making the summer yatra far more comfortable than visits to plains-based religious sites.
  • Direct Rail Connectivity: Katra has its own dedicated railway station on the Udhampur-Srinagar-Baramulla Rail Link, giving it passenger rail access from Udhampur and Jammu in addition to the road corridor.
  • Gateway to Multiple Shrines: Katra serves as the base for not just Vaishno Devi but also Bhairo Baba Temple, Ardh Kuwari Cave shrine, and Nau Devi Temple, giving pilgrims a complete Shakti circuit within a single stay.

Katra works as a pilgrimage base for the Vaishno Devi yatra, a hill retreat from the Delhi NCR summer, and a gateway to the wider Jammu and Kashmir travel circuit.

Chyll by zingbus: Katra Tour Packages

Chyll by zingbus is the tour packages service from zingbus, offering all inclusive group trips to select Himachal destinations.

Packages currently cover Jibhi and Manali, with more destinations being added. You can view the full list of available packages and upcoming departure dates at zingbus.com/tour-packages.

Places Near Katra Worth Exploring

  • Jammu (42 km): The winter capital of Jammu and Kashmir with Raghunath Temple, Bahu Fort, Amar Mahal Palace museum, and the busy Raghunath Bazaar. It is accessible by the 35-minute Katra to Jammu zingbus service.
  • Shivkhori (70 km): A limestone cave temple dedicated to Lord Shiva, located near Ransoo village with a 3 km cave passage and natural Shivalinga formation inside. It is a popular add-on day trip for pilgrims already at Katra.
  • Patnitop (90 km): A scenic plateau hill station on NH 44 at 2,024 metres in the Udhampur district, known for meadows, paragliding, skiing in winter, and the Nathatop viewpoint.
  • Jhajjar Kotli (30 km): A small riverside picnic spot on the Chenab tributary route between Katra and Jammu, popular with families for a short nature break after completing the yatra.
  • Pathankot (153 km): The nearest major junction city in Punjab with Shahpurkandi Dam and a key rail and road connection point for onward travel to Dharamshala and Dalhousie. It is connected to Katra by the 2h 12m zingbus service.
  • Samba (87 km): A historic town in the Jammu division with Samba Fort ruins and Mansar Lake, a pilgrimage site with the Naag Mandir and Surinsar Lake twin lake system nearby.

A Traveller’s Guide to Katra

Getting Around Katra After Arriving by Bus

Katra is a compact town and most accommodations, the Shrine Board registration counter, and the yatra starting point at Darshani Darwaza are within 1 to 2 km of the main bus drop zone at Ashiya Chauraha. Auto rickshaws and shared taxis connect any part of Katra town within 10 minutes.

The yatra itself begins on foot or by horse, helicopter, or battery car from the designated points near the Shrine Board complex. Katra Railway Station is approximately 1 km from the town centre and is connected to Udhampur and Jammu.

Top Attractions in Katra

  • Vaishno Devi Bhawan: The main shrine of Mata Vaishno Devi is located 13 km from Katra at an altitude of approximately 5,200 feet (1,560 metres), accessible by trekking path, horse, or helicopter. It is the primary destination for every visitor to Katra.
  • Bhairo Baba Temple: Located approximately 2.5 km beyond the Bhawan at a higher altitude, the Bhairo Baba Temple is considered an essential part of the Vaishno Devi yatra, with the belief that the yatra is incomplete without this darshan.
  • Ardh Kuwari Cave: A sacred cave temple situated roughly midway on the 13 km trekking route, where Mata Vaishno Devi is believed to have meditated for 9 months. Pilgrims pass through a narrow 10 metre cave passage called the Garbh Joon.
  • Nau Devi Temple: A cluster of nine goddess temples at a single complex in Katra town, representing the Navdurga tradition of the Shakti faith. It is accessible without the trek and is popular with elderly and physically challenged pilgrims.
  • Bhairon Ghati: A scenic viewpoint and resting area on the trekking path offering panoramic views of the Trikuta mountain range and the valley below, frequently photographed by pilgrims during both day and night treks.
  • Katra Market: The main bazaar street running through Katra town is lined with shops selling Kashmiri dry fruits, Pashmina shawls, local religious souvenirs, and pilgrim supplies, making it a busy commercial and cultural corridor.

Hidden Gems in Katra

  • Himkoti Viewpoint: A lesser-visited elevated viewpoint above the main Katra town offering unobstructed views of the Trikuta mountain range and the river valley below, best accessed in the early morning before the pilgrimage crowds arrive.
  • Banganga Stream: The starting point of the official yatra route, where Mata Vaishno Devi is believed to have struck an arrow to produce a spring. Most pilgrims pass through without pausing, but the riverbank offers a calm moment before the trek.
  • Local Village Approach Trails: Short unmarked trails from Katra’s outskirts lead into the lower Trikuta hillside villages with traditional Dogra architecture, terraced fields, and views of the Reasi valley that most pilgrims never see.

Religious and Spiritual Places

  • Shri Mata Vaishno Devi Shrine (13 km from Katra): The primary Shakti Peeths and one of the 108 Shakti Peethas of the goddess tradition, drawing over 8 million pilgrims annually. RFID-based yatra slips are issued from the registration counters in Katra town.
  • Bhairo Baba Temple (15.5 km from Katra): Dedicated to Bhairavnath, the demon slain by Mata Vaishno Devi, this temple is traditionally visited after the main Bhawan darshan as the final step of the complete yatra.
  • Ardh Kuwari Cave Shrine (6 km from Katra): A revered cave meditation site on the trekking route where devotees pass through the narrow Garbh Joon passage as a symbolic act of spiritual rebirth.
  • Shivkhori Cave Temple (70 km): A naturally occurring cave temple in the Ransoo area of Reasi district with a 3 km cave passage and multiple natural stone formations worshipped as Shiva, Parvati, and Ganesh.

Where to Shop in Katra

Katra’s market runs along the main bazaar road through the town centre and is specifically oriented toward pilgrim shopping, offering a blend of religious items, Kashmiri specialties, and souvenirs.

  • Kashmiri Dry Fruits and Spices: Walnuts, almonds, dried apricots, Kashmiri saffron, and Kashmiri chillies are available at fixed-price shops and open market stalls along the main bazaar road. Approximately Rs. 300 to Rs. 1,200 per kg depending on the item.
  • Pashmina Shawls and Woollens: Multiple shops on the main market street and at Lavanya Shopping Complex stock authentic Pashmina shawls, Dogra-style woollen stoles, and Kashmiri embroidered fabric. Prices start from approximately Rs. 500 for machine-made versions to Rs. 4,000 and above for handwoven Pashmina.
  • Religious Souvenirs and Prasadam: Chunnis (red and gold religious offering cloths), brass idol frames, silver coated deity items, and packaged prasadam from the Shrine Board shops are available throughout the Katra market and on the approach to Darshani Darwaza.
  • Cane and Bamboo Crafts: Local artisan items including cane walking sticks used on the trekking path, bamboo crafts, and hand-carved wooden figurines are available from small craft stalls near the yatra starting point.

Most shops in Katra operate from 6 AM to 10 PM, with extended hours during Navratri and other peak pilgrimage periods.

Food and Street Eats

Katra’s food scene is shaped entirely by its identity as a major pilgrimage town, with the majority of eateries serving sattvic vegetarian food in keeping with the religious character of the Vaishno Devi yatra.

  • Chole Bhature: The most widely available pilgrim meal in Katra, found at dhabas, fixed stalls, and fast food joints along the yatra route and in the main market. From approximately Rs. 60 to Rs. 120.
  • Rajma Chawal: A Dogra staple and the most common rice-based meal at Katra restaurants and dharamshalas, prepared with locally sourced red kidney beans and ghee-tempered masala. From approximately Rs. 80 to Rs. 150.
  • Atte ka Halwa: A traditional wheat flour sweet prepared with ghee and sugar, widely sold at Katra’s mithai shops as a prasadam-style sweet for pilgrims. From approximately Rs. 30 to Rs. 80 per portion.
  • Kulcha Chole with Amritsari influence: Katra’s position on the Punjab-J&K corridor brings a distinct Amritsari influence to the local street food, with tandoori kulcha paired with spiced chickpeas available at multiple stalls near the Katra Bus Stand. From approximately Rs. 50 to Rs. 100.
  • Kahwa (Kashmiri Green Tea): Available at tea stalls in the main market and near the yatra registration centre, Kahwa is prepared with green tea leaves, cardamom, saffron, and almonds. From approximately Rs. 30 to Rs. 60 per cup.

All prices are approximate and may vary by season.

Cultural and Festive Events

  • Navratri at Vaishno Devi (March to April and October, 9 days each): Both Chaitra and Shardiya Navratri are the highest footfall periods for the Vaishno Devi shrine, with lakhs of pilgrims arriving over 9 days. Every Katra corridor from Delhi, Gurgaon, Sonipat, Chandigarh, and Jaipur runs at maximum bus capacity during Navratri, and early booking is essential.
  • Vaishno Devi Festival (October, Navratri period): The Incredible India featured Vaishno Devi Festival celebrates the divine feminine tradition at the shrine with special aarti ceremonies, cultural performances, and extended darshan hours at the Bhawan. The Shrine Board manages special queuing and crowd flow during this period.
  • Lohri and Makar Sankranti (January): The winter harvest festivals of Lohri and Makar Sankranti are widely celebrated across Katra and the Jammu division with bonfires, traditional Dogra folk music, and festive food in the town’s community spaces, offering a culturally grounded experience for visitors who arrive outside the main pilgrimage peaks.

Why zingbus Is Best for the Katra Corridor

  • NH 44 Trained Drivers: zingbus drivers on the Delhi to Katra corridor are experienced on the full NH 44 route from Delhi through Karnal, Ambala, Ludhiana, Jalandhar, and Pathankot, a 658 km stretch with varied highway and mountain approach conditions requiring route-specific expertise.
  • Washroom Coaches on Overnight Delhi Services: Bharat Benz AC Sleeper/Seater coaches with onboard washrooms run on the Delhi to Katra overnight corridor, making the 12-hour journey practical for elderly pilgrims, families with children, and solo travellers who cannot stop at highway dhabas late at night.
  • Two Driver Policy on Long Routes: On overnight routes of 6 hours or more, including all Delhi NCR to Katra services, two drivers rotate at designated halts to prevent fatigue on the mountain approach.
  • GPS Active Through Mountain Approaches: Live tracking remains active on all Katra corridor routes including the Jammu valley and Katra mountain approach roads, giving families real time visibility of pilgrimage buses throughout the overnight journey.
  • Multi-City NCR and Rajasthan Network: zingbus connects Katra not just from Delhi but from Gurgaon, Delhi Airport, Sonipat, Karnal, Chandigarh, Jaipur, Amritsar, and Pathankot, covering the widest geographic spread of boarding origins for the Vaishno Devi corridor of any single operator on the platform.
  • Premium Lounge at Delhi ISBT Kashmere Gate: Katra-bound passengers departing from ISBT Kashmere Gate can access the zingbus Premium Lounge for a comfortable pre-departure waiting experience before overnight services.

Frequently Asked Questions

Q1. How do I book a bus to Katra on zingbus?

A: Download the zingbus app, enter Katra as destination, choose date, pick seat, and pay.

Q2. What bus types does zingbus run to Katra?

A: Bharat Benz AC Sleeper/Seater with washroom and Tata A/C Sleeper coaches run on the Katra corridor.

Q3. How many daily buses run from Delhi to Katra on zingbus?

A: Approximately 3 daily buses depart between 7:00 PM and 9:35 PM from Delhi to Katra.

Q4. What is the main boarding point in Katra for zingbus?

A: Ashiya Chauraha Durga Parking is the primary verified zingbus boarding and drop point in Katra.

Q5. How long does the Delhi to Katra bus take?

A: The journey covers approximately 658 km and takes approximately 12 hours under normal conditions.

Q6. Is the Delhi to Katra bus safe for solo female travellers?

A: Yes. Women only seats are available at checkout on all Katra corridor buses, with trained marshals on board.

Q7. Does the Delhi to Katra bus have a washroom?

A: Yes. Bharat Benz AC Sleeper/Seater coaches with onboard washrooms operate on this overnight corridor.

Q8. Can I track my Katra bus in real time?

A: Yes. Use the zingbus app live tracking feature to monitor bus location and ETA throughout the journey.

Q9. What is the best time to visit Katra for Vaishno Devi?

A: March to May and September to October offer the most comfortable trekking weather and clear skies.

Q10. Is Katra safe for pilgrims and solo travellers?

A: Yes. Katra is a well-managed pilgrimage town with Shrine Board security and active administration throughout the year.

Q11. What is the luggage limit on zingbus buses to Katra?

A: One bag up to 15 kg is allowed in luggage storage. One small handbag is permitted inside the bus.

Q12. Can I cancel my Katra bus ticket on zingbus?

A: Yes. You can cancel anytime before departure via the zingbus app or website. Refund terms apply per the cancellation policy.

Q13. What places are near Katra for day trips?

A: Jammu (42 km), Shivkhori (70 km), Jhajjar Kotli (30 km), and Patnitop (90 km) are popular day trip options from Katra.

Q14. Does zingbus connect Katra to Jammu?

A: Yes. The Katra to Jammu route covers approximately 41 km in approximately 35 minutes with 3 daily buses.

Q15. What are the bus options from Chandigarh to Katra?

A: zingbus runs AC Sleeper/Seater buses covering approximately 393 km in approximately 5 hours 13 minutes.

Q16. How early should I arrive at the boarding point for the Katra bus?

A: zingbus recommends arriving at the boarding point 15 minutes before scheduled departure. Use live tracking on the app to monitor the bus.


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