RANCHO CORDOVA, Calif. -- Motorists may be in for a surprise if they spot flashing red lights in their rearview mirrors in this Sacramento suburb during the holiday season.

Police are stopping law-abiding motorists and rewarding their good driving with $5 Starbucks gift cards.

A traffic officer came up with the idea to "promote the holiday spirit and enhance goodwill between the traffic unit and the motoring public," police Sgt. Tim Curran said.