Look at the blue sign on the left just before the lights. It shows 'motorbikes only' for turning left. https://earth.google.com/web/search/hua+hin+police+station/@12.56781164,99.95796163,11.8366766a,0d,15y,313.38874429h,89.08336877t,0r/data=CoEBGlcSUQolMHgzMGZkYWJhZTg2OTEwYzI1OjB4NGQwMTVhNGZjMzFlOD...