US7273328B2 US10/947,053 US94705304A US7273328B2 US 7273328 B2 US7273328 B2 US 7273328B2 US 94705304 A US94705304 A US 94705304A US 7273328 B2 US7273328 B2 US 7273328B2 Authority US United States Prior art keywords led marker highway marker highway power source Prior art date 2003-03-07 Legal status (The legal status is an assumption and is