RCW 46.04.295

"Medium-speed electric vehicle" means a self-propelled, electrically powered four-wheeled motor vehicle, equipped with a roll cage or crush-proof body design, whose speed attainable in one mile is more than twenty-five miles per hour but not more than thirty-five miles per hour and otherwise meets or exceeds the federal regulations set forth in 49 C.F.R. Sec. 571.500.