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Seriously, though, I had to get a trike endorsement in WA to drive my old Zap Xebra! Same test they gave for three-wheeled motorcycles, which is what it was registered as. The written test included questions about the tip-over risk when taking corners on a motorcycle with a sidecar. And the driving test was on a course with cones, and one segment (maybe 2?) had to be covered under a time limit which was not easy with the Xebra's under-powered motor.