Obviously, we can't have perfect enforcement. So we need to focus on the next best: enforce the rules where it makes a difference. As this article abundandtly

Obviously, we can't have perfect enforcement. So we need to focus on the next best: enforce the rules where it makes a difference. As this article abundandtly points out, the greatest cause for injury and death (you know, what we created traffic laws for) are cars. Hence, this is where enforcement needs to happen.