转向灯

• 車(vehicle; cart; car)RADICAL
• 專(specialize in; concentrate on)PHONO-SEMANTIC

A wheel keeps spinning in one direction, so it's called rotating or turning.

• 口(mouth; opening)RADICAL
• 向(face toward; face outward)ASSOCIATIVE

A mouth opening forward like a window of a house looking outward.

• 火(fire)RADICAL
• 丁(nail; peg)PHONETIC

A lamp uses fire to shine brightly, and its sound reading is suggested by the component ding.