DPP to start testing a unique anti-collision system for trams

The Prague Public Transit Company (DPP) schedules first tests of an anti-collision system for trams for September this year. The tests will be performed on a tram of type T6A5 in the area of Tram repair in Malešice. The anti-collision system should prevent railway accidents, i.e. in case of Prague public transport accidents between trams. The system has not yet been fully implemented in the city tram transport. If the system is functional, further testing on selected trams in operation is expected.

DPP cooperates on selection of an appropriate system and its commissioning with Czech Technical University in Prague (ČVUT). If this selected device meets the requirements for city tram transport and the required features, the testing and approval process shall be completed after six months.

The system works on the principle of directional antennas and communicational transmission of short data messages between individual vehicles. According to the set critical parameters, this device then evaluates the degree of risk of tram collision and warns the tram driver. In case of older types of trams this warning can be ensured by acoustic signal and in case of new trams this anti-collision system can stop the tram without the driver’s intervention. The device for testing will be provided free of charge by American company Protran Technology.

In the future, DPP would like to extend this system by similar devices which are used in autonomous control of cars so that it detects also other vehicles and possibly also pedestrians. The reason is that trams have very different and specific driving and braking characteristics compared to cars.

Moreover, DPP controls and measures, in prescribed intervals, so-called braking distances of all trams, in accordance with the Decree of Ministry of Transport no. 173/1995 Coll., Railway Transportation Code. New trams of type 15T ForCity from Škoda Transportation manufacturer have the most efficient braking force. For example, at a speed of 40 km per hour on a flat track a tram not occupied by passengers can stop, using all braking systems, at a distance of approximately 18 metres.

Photo: DPP