Acoustic Vehicle Alerting System Latest News
- The Ministry of Road Transport and Highways (MoRTH) has proposed mandatory Acoustic Vehicle Alerting Systems (AVAS) in electric cars, buses, and trucks to curb road accidents.
- AVAS will generate artificial sound when EVs move at 0–20 kmph, alerting pedestrians and other road users to their presence.
- As per the draft notification, all new EV models manufactured after October 1, 2026, must be fitted with AVAS, while existing models must comply by October 1, 2027.
- The move addresses safety concerns caused by the near-silent operation of EVs at low speeds, ensuring better audibility and reducing accident risks.
Acoustic Vehicle Alerting System (AVAS)
- AVAS is a safety feature designed to generate an audible warning sound for electric and hybrid vehicles, which are often nearly silent when operating at low speeds.
- It's intended to alert pedestrians, cyclists, and other vulnerable road users to the vehicle's presence, helping to prevent accidents.
Working of AVAS
- AVAS operates automatically based on the vehicle's driving condition:
- Activation
- The system is typically mandated to activate when the vehicle is moving at low speeds, generally from startup up to a threshold like 20 km/h (about 12 mph) or 30 km/h depending on the specific regulations.
- It also usually activates when the vehicle is in reverse gear, regardless of speed.
- Sound Generation
- The AVAS uses an external speaker (often mounted beneath the bodywork) to generate an artificial, continuous sound.
- This sound is usually designed to resemble that of a conventional internal combustion engine vehicle or a distinct, recognizable warning signal.
- Speed Synchronization
- The system is connected to the vehicle's electronic control unit (ECU) or CAN-Bus to get real-time data on speed and gear.
- The pitch (frequency) and sometimes the volume of the generated sound automatically vary in proportion to the vehicle's speed.
- This change in characteristic helps pedestrians to perceive the vehicle's acceleration, deceleration, and distance.
- Deactivation
- When the vehicle exceeds the low-speed threshold (e.g., above 20 km/h or 30 km/h), the AVAS typically deactivates.
- At higher speeds, the natural noise generated by the vehicle's tires on the road and aerodynamic drag becomes sufficiently loud to alert other road users.
- Activation
Why India Needs Acoustic Alert Systems in EVs
- Electric vehicles (EVs) running below 20 kmph produce minimal sound, making them harder to detect and raising the risk of accidents, especially for pedestrians and cyclists.
- To address this safety gap, the MoRTH has proposed Acoustic Vehicle Alerting Systems (AVAS), which will generate sound to warn road users of an approaching EV.
- The move comes amid a rapid surge in EV adoption.
- According to MoRTH’s e-Vahan portal, 19.5 lakh EVs were sold in 2024, accounting for 7.44% of all vehicles sold that year.
- India’s EV share has grown from just 0.01% in 2014-15 to 7.31% in 2024-25, with over 56.75 lakh EVs registered by February 2025.
- The government sees AVAS as crucial, especially since EV penetration is expanding beyond metros into suburbs and small colonies, driven by the popularity of e-rickshaws and two- and three-wheelers for last-mile connectivity.
AVAS Rules Exclude Two- and Three-Wheelers for Now
- The draft notification on Acoustic Vehicle Alerting Systems (AVAS) currently applies only to electric cars, buses, and trucks — not to two-wheelers, three-wheelers, e-rickshaws, or e-carts.
- Analysts, however, caution that excluding these vehicles, which often operate in congested urban and suburban areas, could raise accident risks.
- While EVs generate tyre noise at speeds above 20 kmph, they remain nearly silent below this threshold.
- Experts suggest AVAS should cover all categories of EVs, as seen in countries like the US and Japan, to ensure comprehensive road safety.
AVAS FAQs
Q1: What is AVAS in electric vehicles?
Ans: AVAS is a sound-emitting safety device that alerts pedestrians and road users when EVs move silently at speeds below 20 kmph.
Q2: When will AVAS become mandatory in India?
Ans: All new electric cars, buses, and trucks must have AVAS from October 1, 2026, while existing models must comply by October 1, 2027.
Q3: Why does India need AVAS for EVs?
Ans: Since EVs are nearly silent at low speeds, AVAS reduces accident risks by alerting pedestrians, cyclists, and other vulnerable road users.
Q4: Are two- and three-wheelers included in AVAS rules?
Ans: Not yet. The draft mandates AVAS only for electric cars, buses, and trucks, though experts urge inclusion of two- and three-wheelers for safety.
Q5: How does AVAS work in EVs?
Ans: AVAS uses external speakers linked to the vehicle’s ECU to emit artificial sounds, which change with speed, making EVs more audible to pedestrians.