Secondary controls Devices in a vehicle that do not direct its movement or braking but control how the driver sees out of the vehicle and how the vehicle is seen; examples are de-misters, windscreen wipers, washers and hazard lights
Single lane (for shuttle working) Control of traffic through road works one-way system where manual operated stop and go signs are in use Stationary Stopped, for example in a line of traffic, at a stop light or in a parking space
Swan neck The course followed by a vehicle when the driver passes the correct point for taking a right turn and needs to make a bigger effort to correct the position when completing the turn
Tabard Sleeveless yellow fluorescent vest worn by motorcyclists with ‘L’ plates clearly displayed to front and rear.
Tachograph A device that measures and records the speed, distance and time travelled by a vehicle
Tailgating Driving too close to a vehicle in front
Tarpaulin Waterproof sheet used to cover cargo being transported
T-junction A junction where the meeting of a minor road with a major road forms a ‘T’ shape
Tread (tyres) The grooves on a tyre which provide a grip on the road
Variable message sign An upright electronic sign, whose content changes to inform on roads and road safety
Vigilant Careful, watchful, looking out for possible danger
Work vehicles Vehicles used at sites or roadworks that usually do not drive on the road
Yield Give way to other road user