Design for Large Scale Software Reuse: An Industrial Case Study
ICSR '96 Proceedings of the 4th International Conference on Software Reuse
SafeSpection --- A Systematic Customization Approach for Software Hazard Identification
SAFECOMP '08 Proceedings of the 27th international conference on Computer Safety, Reliability, and Security
Safety Requirements for a Cooperative Traffic Management System: The Human Interface Perspective
SAFECOMP '09 Proceedings of the 28th International Conference on Computer Safety, Reliability, and Security
Software architecture of a safety-related actuator in traffic management systems
SAFECOMP'12 Proceedings of the 31st international conference on Computer Safety, Reliability, and Security
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Traffic control and information systems are used in traffic technology for information propagation from a higher order control unit to the traffic participant. Nowadays, the user interface for the traffic participant is provided via freely programmable signs displaying e.g., traffic jam warnings or speed limits. These signs can be switched on or off and fed with arbitrary data corresponding to the present traffic situation. However, signs are manifold in size, functionality and means to communicate with them. For that reason, a certain degree of configurability of the embedded safety-critical software is needed in order to meet project-specific demands. Configurability has its advantages in offering a certain degree of flexibility, but poses a risk on safety integrity and requires additional efforts for tools and documentation. This paper focuses on configurability of software in the field of Variable Message Signs (VMS). Possible configuration parameters are considered with regard to its importance during the life-cycle of a VMS and its safety impact. Considering pros and cons, finally an idea of an optimum degree of configurability is being given.