When a police officer raises an arm overhead, traffic in front must stop, but traffic to the sides may proceed while slowing down to a stop-ready speed (jokō).

Answer: False

Explanation

According to the Rules of the Road, a police officer's hand signal with an arm raised overhead means "traffic in front must stop." There is no description regarding traffic to the sides, and only traffic in front has a duty to stop with this hand signal. There is no rule that traffic to the sides may proceed at jokō.