Alstom Homologates ODAS Tram Safety System In 2017

Alstom offers two advanced driver-assistance systems (ADAS) for urban light rail, ODAS and COMPAS, designed to mitigate accidents in complex city environments. The Obstacle Detection Assistance System (ODAS) was introduced in 2017 as the first homologated system of its kind for trams. Both systems aim to provide proactive safety support to vehicle operators navigating streets shared with pedestrians, cyclists, and other vehicles.

The ODAS platform functions as a forward-looking sensor suite. It utilizes stereo vision cameras combined with predictive mapping to monitor the track ahead for potential hazards. The system is engineered to detect pedestrians, vehicles, or debris that may obstruct the tram’s path. Upon detection of a risk, ODAS alerts the driver and has the capability to apply gentle, automated braking to prevent or reduce the severity of a collision. The driver remains in full control of the vehicle.

COMPAS, the Collision Prevention Assistance System, expands on the ODAS foundation by incorporating overspeed prevention. This system uses the tram’s real-time location data and stored track geometry information. By cross-referencing position with track layout, COMPAS ensures the tram adheres to safe speeds, particularly through curves and complex sections of the network. The stated goals are reductions in derailments and rear-end collisions.

A key market feature of the technology is its installation flexibility. The systems are designed for retrofitting onto existing tram fleets, including those manufactured by competitors, as well as for line-fitment on new light rail vehicles. This adaptability allows operators to upgrade safety levels across mixed-asset fleets without requiring a complete vehicle replacement. Publicly available verification data confirms the systems’ purpose but notes that specific technical specifications and cost details are not disclosed.

As urban density increases, these systems provide a technical solution for transport authorities pursuing “zero accident” objectives. The technologies offer an additional layer of safety to support drivers, maintain passenger comfort, and improve the operational reliability of urban tram networks.