On the M42 there is a time trial area. What's that all about?

Question

On the M42 there is a time trial area. What's that all about?

Answer 1

If it`s the same as the one on the A1m south of Durham it is to keep vehicles over 7.5 tonne GVW from using the ouside lane to assist the free flow of traffic.

Answer 2

Thts the it were they calculate you average speed isnt it ? well if it isi its a different way to make money as they can tell by how quickly u reach the other end weather or not u speeded.