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They don't ! Maximum speed on a dual carriageway is 60mph - Motorways is 70mph.
The set standard lane width for dual carriageways and motorways is 3.65 metres. The set standard width for hard shoulders is 3.3 metres.
A dual carriageway will probably have traffic lights, roundabouts and other road features similar to normal roads so cannot be a motorway. Also, a motorway has to have a hard shoulder as well.
This is a Ditloid. The answer is, 70 = National Speed Limit on a Dual Carriageway.
No it is not, however York is quickly accessed by the A64 Dual carriageway Fromm J44 of the A1(M). The first exit for York is 13 miles from the A1(M)
The M2 Motorway in Kent, England, is only 25.7 miles long (41.4km). It is extended by the A2 dual carriageway at either end which makes the road longer.
mid 80's
On a dual carraigeway with National Speed limit signs (a white circle with a diagonal black stripe) the limit for cars and commercial vehicles up to 7.5 Tonnes is 70 mph. There are lots of conditions that apply to this statement, so don't expect this answer to cover all possibilities.
In Great Britain, the national speed limit which is in place unless otherwise signed is:70 miles per hour for dual carriageways and motorways60 miles per hour for single carriageways30 miles per hour for built up areasThere are different speed restrictions for goods vehicles, large vehicles and vehicles that are towing.
Poole is a massive city on the south coast but has no motorway! There are a few short stretches of dual carriageway and loads of speed cameras. The nearest motorway is the M27 in Southampton.
Unless specifically stated by a sign, the speed limits for cars are: Motorway: 70 MPH Dual Carriageway: 70 MPH Single Carriageway: 60 MPH Built up areas: 30 MPH (in towns, villages etc) Other vehicle types such as trucks and buses have their own speed limits.
its about 800km (480 miles) form Melbourne to sydney on the Hume highway. its a dual carriageway most of the way and can be done in 8 to 10 hours. of course if you want to stop and look at things it takes longer, and if you want to sightsee give yourself 2 or more days and take the coast road