Direction signs with blue background and white letters are only used for motorways.
The right hand lane on a dual carriageway can be used for turning right as well as overtaking. On a motorway it is only for overtaking.
Both have a central reservation which you must not cross. Unless when entering a dual carriageway and turning right.
Motorways have a hard shoulder for use in emergencies.
Some vehicles may be travelling slower on a dual carriageway compared to a motorway.
Motorways must not be used by provisional licence holders, cyclists, agricultural vehicles, horse riders and some slow moving vehicles.
