Vehicle activated signs
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Vehicle Activated Signs (VAS), are roadside digital signs that use radar technology to display a message when they are approached by a driver exceeding the speed limit or going too fast for the type of road, especially when there is a hazard, e.g. a bend or a crossroads.
VAS are normally used to try to reduce a driver's speed by displaying the speed of the vehicle or a message e.g. 'Caution Bend' or 'Caution Too Fast - Slow Down'. They can also warn drivers of a safety camera if they are exceeding the speed limit. VAS do not record any data for prosecution purposes.
VAS can be moved from site to site and are used as an alternative to speed cameras or humps.