Wilton Larron Mahaffey, Appellant v. the State of Texas

Summary

The Court held that a merge is not a "turn" under Texas Transportation Code §545.104(a) and therefore the signal requirement does not apply to a merge; it reversed the Court of Appeals and remanded for a determination whether the merge was a lane change requiring a signal. The dissent argued the majority overstates the holding and criticized reliance on administrative handbooks and prior case law.