Gross-weight determined penalties won't mean a thing unless the person breaking the law actually hurts someone. Instead, why not just hike the fines for certain violations evenly so we've got a stronger deterrent in place (and get to avoid creating extraneous legislation and procedure)? Double the fines for things like running a stop and breaking the speed limit, and suddenly it feels less like an expensive inconvenience and a lot more like an insistence that breaking laws designed for safety is a serious no-no.

No, it's not a catch-all solution, but I'd say it'd be a much stronger deterrent to unsafe and unlawful road behavior for all road users.