Safety device for selectivity track-guided or road travelling vehicles

Safety device for selectively track-guided or non track-guided road travelling vehicles with sensing rollers rolling on lateral transverse guide bars of a track-guided road section, said sensing rollers being adjustably controlled and actuated by auxiliary power for movement between a work position near the ground when used in track-guided operation and a retracted rest position when used in non track-guided operation, said safety device comprising:

• an optical indicator device disposed behind an exit point of a track-guided road section, said optical indication device being switchably controllable between a normal stop mode signal warning an approaching vehicle drive not to proceed on to an adjacent non-track guided road section and a go mode signal advising a vehicle driver that the vehicle may safely proceed onto the non track-guided road section;
• monitoring means for monitoring whether the sensing rollers are in the work position or in the retracted rest position;
• and control signal means responsive to the monitoring means for controlling the optical indicator device in such a manner as to switch the optical indicator device to the go mode signal only when the sensing rollers are in the retracted rest position.