ive been told clearance between rail and road surface must be no less than 100mm...

and heard stories of hw patrol using coke cans - "if rail clears a coke can - its legal"

tyres are not legal if they are 2 inches larger than factory standard diameter...

width of tyres/track not legal if more than 1.5 inches either side of factory standard


last 2 points are not regularly picked on because the police dont know all the specifications of particular models - that would be more of a "over the pits" scenario...