Ken Roper (Oxford Mail letters, June 23), said I’d missed the point when you said trucks could be speeding.

After having a chat with a VOSA fella, a truck driver I know, I have the following information.

Modern trucks have speed limiters built in with the engine management and an electronic speed limiter.

These are near impossible to get round without being in a garage because they are linked to the gearbox and fuel system.

Anything older than about 2006 may have the speed limiter connected to the power from another system, and could be capable of being by-passed fairly easily by removal of a fuse.

However, this would also affect the ABS and other systems. Also these old trucks will have done such a massive mileage, anything from 500,000 to 1.3m miles, probably won’t be able to go that fast anyway.

And with the fines and repercussions for bypassing tachos being so massive, it really is not financially sound to be caught driving a vehicle without a limiter.

There is a fine of up to £50,000 for the driver and owner, plus the possibility of prison time. It is not worth it.

And the chance of there being more than one truck in the same area of the same road, travelling in the same direction, is tiny.

NEIL THOMPSON Cricket Road Cowley Oxford