Masstrans

Acoustic Vehicle Alerting System

Intercity

Acoustic Vehicle Alerting System

An automatic acoustic warning system that makes electric buses audible at low speeds and in reverse, restoring the sound cue pedestrians rely on. Engineered to the requirements of India's AIS-173.

Acoustic Vehicle Alerting System

Built For Performance.
Designed For Reliability.

Automatic Activation

Switches on by default at every start-up, with no action needed from the driver.

Low-Speed & Reverse Coverage

Sounds from start-up up to about 20 km/h, and whenever reverse is engaged.

Front & Rear Speaker Zones

Multi-zone coverage gives a clear, localisable warning.

Bus-Ready Design Options

Weatherproof, vibration-rated underbody enclosures, a driver pause switch, fault alerts and a brand-tuned soundscape within legal limits.

Built For Performance.
Designed For Reliability.

Automatic Activation

Switches on by default at every start-up, with no action needed from the driver.

Low-Speed & Reverse Coverage

Sounds from start-up up to about 20 km/h, and whenever reverse is engaged.

Front & Rear Speaker Zones

Multi-zone coverage gives a clear, localisable warning.

Bus-Ready Design Options

Weatherproof, vibration-rated underbody enclosures, a driver pause switch, fault alerts and a brand-tuned soundscape within legal limits.

Built to Integrate.
Designed for every Industry.

Bus

Bus

Train / Railways

Train / Railways

Metro

Metro

Airport Shuttle

Airport Shuttle

School Buses

School Buses

Employee Transport

Employee Transport

City Transit Buses

City Transit Buses

Electric Buses

Electric Buses

BRT Systems

BRT Systems

Healthcare

Healthcare

Warehouse

Warehouse

Bus

Bus

Train / Railways

Train / Railways

Metro

Metro

Airport Shuttle

Airport Shuttle

School Buses

School Buses

Employee Transport

Employee Transport

City Transit Buses

City Transit Buses

Electric Buses

Electric Buses

BRT Systems

BRT Systems

Healthcare

Healthcare

Warehouse

Warehouse

Related Products

Frequently Asked Questions

An Acoustic Vehicle Alerting System automatically generates an external warning sound whenever an electric vehicle is moving quietly at low speed or in reverse.

Below about 20 km/h, electric buses are almost silent. That is exactly where buses operate most: depots, terminals, bus stops, school zones and stop-and-go traffic.

Yes. AIS-173 requires AVAS on new electrified M and N category vehicles, including buses, from 1 October 2026, and on existing models from 1 October 2027.

From start-up up to about 20 km/h going forward, and at any speed in reverse. Above 20 km/h it switches off, as road and wind noise are enough.

Yes, A brand-distinct tone can be tuned for an OEM or fleet, provided it stays within the legal sound envelope.

Need Help Selecting the Right Product?

Our Product Specialist can help you identify the right transportation technology for your operational needs.

Contact Sales

Frequently Asked Questions

An Acoustic Vehicle Alerting System automatically generates an external warning sound whenever an electric vehicle is moving quietly at low speed or in reverse.

Below about 20 km/h, electric buses are almost silent. That is exactly where buses operate most: depots, terminals, bus stops, school zones and stop-and-go traffic.

Yes. AIS-173 requires AVAS on new electrified M and N category vehicles, including buses, from 1 October 2026, and on existing models from 1 October 2027.

From start-up up to about 20 km/h going forward, and at any speed in reverse. Above 20 km/h it switches off, as road and wind noise are enough.

Yes, A brand-distinct tone can be tuned for an OEM or fleet, provided it stays within the legal sound envelope.

Need Help Selecting the Right Product?

Our Product Specialist can help you identify the right transportation technology for your operational needs.

Contact Sales