I think faulty vehicle lighting must be the most common, significant safety-related fault on vehicles.
Of course - anyone can have a bulb fail at any time.
But it shouldn't be beyond the wit of ANPR cameras to spot faulty lights, and auto-generate an email or letter to the registered keeper.
Add the faulty-lights vehicle plate to a database, and if it appears again with the same fault after - say - 2 weeks have elapsed since the first letter - send them a fine in the post.
Harsh - but it would make a greater contribution to safety than fines for slightly exceeding the speed limit.