Diverging Moving apart. For example, traffic taking a right turn when other traffic is moving straight ahead or traffic leaving a motorway
Fixed-wheel bicycle A bicycle you can back-pedal to brake. It has one wheel which cannot rotate independently of the pedals
Gantries Overhead steel structures across carriageways to hold up signs
Garda Síochána Ireland’s national police service
Ghost island A marked area on the road that shows where a motorway and a slip road meet
Graduating Moving from one stage to the next
Gross vehicle weight (GVW) The weight of a vehicle together with the maximum load it is designed to carry
Hard shoulder A part of the road that is divided by broken or continuous yellow lines from the rest of the road and should be used only by certain road users in certain situations
Hatched marking Chevron markings on the road which help separate traffic lanes
Hazard Anything that could be a source of danger on the road
Intoxicant Something that can affect a person’s behaviour, perception, mood or alertness
Invalid-carriages Vehicles specially designed or built for people with disabilities. This does not apply to conventional motor cars which are specially adapted for disabled people and which are permitted to use a motorway
MAM Maximum Authorised Mass
National road A major road linking urban areas and consisting of motorway roads identified by ‘M’ route numbers, for example M1, and other routes identified by ‘N’ route numbers, for example N11
Land tractor Commonly called ‘an agricultural tractor’, these vehicles are designed to work on land in connection with agricultural, forestry or land drainage-type operations and are driven on a public road only when proceeding to or from the site of such work
Lighting-up hours The period that starts one half-hour after sunset on any day and expiring one half-hour before sunrise on the next day.
Luas The tram system operating in Dublin city and suburbs