Plymouth Rd., between Murfin and Nixon Roads is one of the favorite stretches of highway in Ann Arbor for nearly constant trolling by Ann Arbor Police running moving radar. Speed limit should be 50 mph, with this wide, four lane road, an additional center turn lane, and a portion with a median. Speed limit jumps back and forth between 40 and 45 mph. Be on the alert for dark blue Crown Vics., difficult to see markings, with a low profile roof lamp array, or lights all in interior. Ann Arbor has been on K-band radar, but the cars are switching to Ka. Consider Ann Arbor, Michigan one huge speed trap. The city is cash strapped, and the cops are now the tax collectors.