Will ‘talking’ cars reduce road accident deaths?

Why in the News

The Union Ministry of Road Transport and Highways will mandate Vehicle to Vehicle (V2V) communication, a system through which vehicles exchange movement data wirelessly and warn drivers of an approaching collision risk. The draft Central Motor Vehicles (Amendment) Rules, 2026 set out that mandate and invited public objections within 30 days of publication.

How does Vehicle to Vehicle communication work?

1. An on board unit does the exchanging: An On Board Unit (OBU) fitted in the vehicle sends data to and receives data from other vehicles wirelessly.
2. The data exchanged is movement data: Vehicles continuously share real time speed, position, direction and acceleration.
3. The carrier is cellular Vehicle-to-Everything technology: The system uses cellular Vehicle-to-Everything (C-V2X), a mobile network based standard for vehicle communication, in the 5.875 GHz to 5.925 GHz band.
4. The alert reaches the driver before the hazard is visible: A vehicle braking suddenly triggers a slow down alert in nearby vehicles ahead of any driver seeing the brake lights.

What do the draft Rules mandate, and by when?

1. Compliance begins with voluntarily fitted vehicles: Two and three wheelers, cars, buses and goods vehicles manufactured on or after 1 October 2027 must meet Automotive Industry Standard 230 (AIS-230) if they carry a V2V system.
2. Fitment becomes compulsory a year later: Vehicles manufactured on or after 1 October 2028 must be fitted with a V2V system meeting AIS-230 specifications.
3. AIS-230 is the technical backbone: The standard lists the requirements a V2V system must satisfy and provides for phased introduction of other safety features.
4. The spectrum was cleared first: The Centre exempted the 5.875 GHz to 5.925 GHz band from licensing requirements in June 2026, so original equipment manufacturers can use it in new vehicles.
5. The cost sits on the new vehicle: On Board Units are expected to cost Rs 5,000 to Rs 7,000 and will be installed in new vehicles first.

What can V2V do that camera based systems cannot?

1. Existing systems are bounded by the line of sight: Camera based advanced driver assistance systems (ADAS), which use sensors to warn a driver or intervene in braking and steering, work only as far as the road is visible.
2. V2V works around obstructions: It establishes contact with other vehicles at blind corners and behind large trucks.
3. The warnings cover named hazards: Alerts flag sudden braking, black spots, unsafe lane changes, obstacles such as parked vehicles on roadsides, fog and potential collision risk.
4. The detection range is about 300 metres: V2V systems typically identify vehicles within that distance.
5. The two systems are complementary: V2V is expected to add forward collision prediction to what camera based systems already do.

What does the limited deployment record show?

1. Deployment abroad is narrow: V2V is working in a few countries, including the United States.
2. Aviation already runs the same idea: Aircraft broadcast their position, speed and altitude, and nearby aircraft and ground stations receive that broadcast.
3. The road sector is at an earlier stage: The broadcast approach is standard in global aviation and is still evolving on roads.

Challenges to the Vehicle to Vehicle mandate

1. The benefit depends on how many vehicles carry the unit: A network that warns only about equipped vehicles is worth little until a large share of the fleet carries the equipment. Eg. A mandate applying to vehicles manufactured from 2028 reaches none of the vehicles already registered, which stay on the road for well over a decade.
   The Fix: Fund retrofitment of On Board Units in commercial goods and public transport fleets first, since those vehicles cover the highest annual mileage.
2. The allocated band may not carry the traffic load: It is unclear whether the frequency band set aside can support all vehicles broadcasting at once. Eg. A single congested urban intersection can hold several hundred vehicles inside the 300 metre broadcast range.
   The Fix: Fix a tested message capacity per square kilometre inside AIS-230 before the compulsory fitment date arrives.
3. Continuous broadcasting creates a movement record: The system stores a large volume of data about vehicles, which exposes it to cyber attack and to surveillance use. Eg. FASTag toll crossings already generate a dated record of where a vehicle has been.
   The Fix: Mandate rotating pseudonymous vehicle identifiers and a fixed data retention limit in the final Rules.
4. A wrong message can cause the crash it exists to prevent: Miscommunication between vehicles can trigger braking or a lane change that was never warranted. Eg. Automatic emergency braking systems have drawn regulatory investigation abroad over unprompted braking on highways.
   The Fix: Require cryptographic message authentication and a fail safe that suppresses alerts when integrity checks fail.
5. The group most at risk is the hardest to equip: Two wheeler riders account for the largest share of road deaths in India, and the unit price is a significant fraction of an entry level motorcycle’s cost. Eg. Two wheelers account for roughly 44 per cent of road accident fatalities recorded in the Ministry’s annual Road Accidents in India report.
   The Fix: Subsidise On Board Units for two wheelers through the existing vehicle scrappage and safety incentive route rather than loading the cost onto the buyer.

Conclusion

V2V communication can make Indian roads significantly safer by enabling vehicles to detect hazards beyond line of sight and warn drivers earlier. With strong cybersecurity, privacy safeguards, affordable adoption, and wider fleet coverage, the mandate can become a major step toward smarter, safer and more connected mobility in India.

Back2Basics: Central Motor Vehicles Rules, 1989

1. Parent statute: They are framed under the Motor Vehicles Act, 1988, which governs registration, licensing, permits, insurance and road safety in India.
2. What they cover: They set vehicle construction and maintenance standards, driving licence procedure, registration requirements and control of traffic.
3. How they are changed: The Union Ministry of Road Transport and Highways notifies amendments, publishing a draft for public objections before final notification.
4. Enforcement: Penalties for non-compliance flow from the Motor Vehicles Act, 1988, whose 2019 amendment sharply raised fines for traffic offences.