tachograph:
Legally the height marker should be set to no less than the highest part of the vehicle and no more than 25mm more than the highest part of the vehicle, I doubt the DVSA would be too pedantic about the 25mm but given all the bridge strikes we keep hearing about I imagine they would not hesitate to give out the £50 fixed penalty fine for anyone who’s vehicle height marker is obviously set much lower than the vehicle height.
I thought you could set the height marker as high as you liked over the real height but it only becomes illegal if you then pass under a bridge which is lower than the height that your marker is set to if you know what I mean.