just over 2,200 miles
76
I get about 42 miles to a UK gallon - mixed driving with 50% motorway driving at speeds I should not document.
Abou 50 miles north of London next to the M1 motorway
A car going at the maximum legal speed on a UK motorway. Also, a cheetah.
On a UK motorway (limit 70 mph), it should take 24 minutes.
The M26 is 9.9 mi (15.9 km).
The first Motorway in UK (M6) was opened in 1958.
There are various routes from Dublin to Athlone. The best is to go by the M4 motorway to Kinnegad and from there to Athlone by the M6 motorway. Going that way it is about 77 miles. That would be about 125 kilometres.
The M42 motorway is a major road in England. The motorway is 55 miles in length and spans Bromsgrove in Worcestershire to Ashby-de-la-Zouch in Leicestershire.
A motorway in the UK is a major 'divided highway' type of road, serving major towns and cities. A motorway 'marker' could be the small signs seen along a motorway that identify the exact location and distance to the end of the motorway (useful for reporting position if your car breaks down). These are every 500 metres. If the question is about how motorways are marked in the UK, then all motorway signs are white text on a blue background. Exits (off-ramps) are signposted well in advance while driving on the motorway.
I believe that the highest numbered motorway in the UK is the M898 a short 1/2 mile spur off the M8 in the Glasgow area.
25 km