It has to do with classification . A power assisted bicycle can only be electric .

Because it is gas powered and you have control over the clutch it is classified as a motorcycle . You then need all of the DOT approved equipment (turn signals, lights, horn, registration, insurance etc. ) .

With an automatic (centrifugal clutch) you could classify it as a moped . Again the same DOT equipment is required .

It comes down to if it is powered by gas it is no longer a bicycle . It all depends on the mood of the cop that is pulling you over though . ..... D.J.

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