Diamond Bar Boulevard near Highland Valley Road
Diamond Bar Blvd. drops from 50 to 40 mph at Highland Valley. On Tuesdays there are several motorcycle officers with radar waiting below the crest of the hill, near the onramp to the 57 fwy North. They wait for westbound traffic coming down the hill and catch those who did not notice the 10 mph drop in the speed limit. According to the mayor, Tuesday is ticket day in Diamond Bar.
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