Excessively tinted glass is seen as a serious issue but one which
currently affects only a small number of the 24 million vehicles
tested annually. To include this item in the MOT test would require
all 18,000 garages to incur expenditure on special test equipment
and the time taken to carry out an MOT would increase. The MOT
fee would have to be raised to cover the extra time and investment.
This extra cost would affect all motorists - all for a small number of
vehicles. With the current levels of offending, roadside enforcement
is a better route as it targets the offenders while minimising the
cost and inconvenience to compliant road users.