M-way motoring
tubby
There is no slow lane.
The standard limit for both lanes on a motorway is 70mph.
While the offside lane is nominally for overtaking, you are not permitted to exceed 70mph.
Motorists are entitled to travel in the offside lane at 70mph if they wish.
However, good practice comes into play:
If in the nearside lane travelling at 65mph, you may find yourself going to 75 in the offside to overtake. Not strictly legal, of course.
Similarly, there is no need to be in the offside lane if you are unimpeded on the nearside.
Motorway volumes being what they are, both lanes are in equal use at busy times.
You are permitted to 'undertake' on the nearside if the offside lane is travelling slower than you. Should be avoided wherever possible though.
T.