ALARP: A railway automatic track warning system based on distributed personal mobile terminals

Below you will find a short summary of the project. For further information please contact the project managers via the contact button on the right side.

Picture: IAD


Safety in the construction industry is an important issue in most industrial countries. Railway construction, in particular, is associated with high risks, as work is often carried out on construction sites without interrupting train traffic.

The existing automatic train warning systems (ATWS) have shown problems that prevent widespread use. They are more expensive to purchase and difficult to operate. Training on such systems is very complex and time consuming.

The EU-funded project “A railway automatic track warning system based on distributed personal mobile terminals – ALARP” has focused on the development of alternative solutions.


The aim of the ALARP project was to develop a concept and prototypes of a mobile warning system. The basic functions of this system are the warning, alerting and localisation of the user on site as well as a possibility to communicate.

Picture: IAD


Within the ALARP project, the IAD was responsible for the design of the human-machine interfaces. This includes the design of warning signals or prototypes of the signal generators for the visual, acoustic or tactile human sensory channel. Here, special parameters were researched that present suitable signals to the track workers (e.g. audio signals in clearly perceptible frequencies or LEDs that light up in a certain rhythm).


The IAD has designed warning cascades that warn track workers in parallel or sequentially via several different types of signals (visual, acoustic, tactile). Thus, warnings of varying degrees of urgency can be implemented. Furthermore, the IAD has helped to design a feedback interface that allows workers to acknowledge warnings or simply respond to messages.


The project ALARP was funded under the program FP7-TRANSPORT by the European Union from 2010 to 2013 under the grant agreement no. 234088.