There are many reasons to include bicyclists in your consideration of traffic enforcement; here are just a few:

Reason #1
Many bicycle crashes are caused by unlawful behavior. Enforcement intervention that changes operator behavior can save lives and prevent injuries.

Discussion:
NHTSA studies have shown that public education alone is not effective in changing behavior. This is why NHTSA encourages States to use a comprehensive approach to increasing safety belt use, for example. The approach includes public information and education, media messaging, along with enforcement efforts. NHTSA strongly believes that a law enforcement presence is necessary to influence behavior change. Further, a one- time or even annual effort is not frequent enough to create a change in behavior or sustain the desired behavior. These same principles apply to enforcement of laws intended to promote safe behaviors among cyclists and motorists sharing the roadway.