Manoeuvre Any action to steer or change the course of a vehicle, such as moving off, changing lanes, leaving a roundabout, turning left or right, taking U-turns or reversing
Median space A gap provided in the centre of a dual carriageway to allow vehicles to cross through or turn onto another road
Merging Coming together. For example, traffic entering a motorway from a slip road and joining other traffic
Moped A light motorcycle of 50cc or less that has a maximum speed of 45kmh
Motorcycle engine capacity Cubic capacity or cc of engine
Motorcycle power rating Engine power output
Muscular atrophy Wasting of muscles
Nearside Left-hand side
Negligence Failing to act with reasonable care
Night-driving mode (mirror) Darkened reflection which reduces dazzle
Non-national road A local or regional road linking villages and towns within a county or district identified by an R or L number sign
Offside Right-hand side
Ophthalmic optician An optician qualified to prescribe glasses and contact lenses and detect eye diseases
Outer lane The lane nearest the centre of the road in a dual carriageway or two-or three-lane motorway
Permit A legal document giving permission to do something like park in a particular place or use certain roads
Pinch points Traffic calming measure where sections of the road are narrowed to reduce speed
Pointsman A Garda who controls the flow of traffic
Prescription A written note from a doctor or hospital stating what medicines a person should take and when they should take them
Professional drivers Drivers whose main income is from driving, such as bus, coach and haulage drivers
Radial tyres (radial ply tyres) Tyres with cords made of steel and other materials, which run around under the treads to strengthen them and make them last longer
Retarder A device that reduces the speed of the vehicle without using the brakes
Safe headway A safe distance between two vehicles on the road