Here is a picture from Sim City 4 (Rush Hour) which shows a "motorway", with a motorway junction and on and off ramps. (top right of the screen)
I'm glad the British have a sensible naming system. We have freeways which change from 2 lanes both-way, to 3, to 4 and 5 (with or without a dedicated bus lane). Some also have rail going down the middle between the two directions.
Well I say three lanes loosely.
In the middle of complicated junctions, there'll often be a fourth lane to give drivers two lanes each for each direction. Then for a while there'll be two lanes, then it'll grow to three again.
There are *some* discrepancies but generally British motorways are three lanes.
Incidentally, in Britain we have the usual way of numbering motorways - M1, M4, M5, M6, M25, M40, M62 and so on and so forth.
But there is also a secondary category for roads that were originally A-roads (that is to say "primary" routes) that have been given motorway status.
These are usually referred to with an M in brackets. So the Aston Expressway in Birmingham (which leads to Spaghetti Junction on the M6) is the A38(M).
It's a little more confusing than I've made out.
Motorways - generally 3 lanes, occasionally 4 in busy sections.
A-Roads with Motorway status - generally 2 lanes, with 3 in some areas.
A-Roads - "Trunk roads" are often dual carriageways and are the main routes where motorways don't apply. A lot of A-Roads are single carriageway (that is one lane in either direction), especially in urban areas. I personally live on the A491.
B-Roads - Are almost always single carriageway and are like minor routes. The B4173 diverges from the A491 a little way down the road and carries traffic to the main road at the bottom a little closer to Stourbridge than the A491 does.
Unclassified roads are usually streets - and occasionally small countryside roads. In the cities, they will generally be a normal single carriageway but in the countryside they may be single track - that is only one car's width. Then there are passing places for cars to stop and let others through and so on.
As I said - a little more confusing than I made out, but to be honest - and I'm sounding my own country's horn a little here - I think it's a top-notch classification system that far outstrips that of the Continental countries.
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