The driver of the car ahead puts an arm out of the car, extends it 45 degrees downward and moves it up and down. What does this hand signal mean?
A hand signal with the arm extended 45 degrees downward means different things when it is just HELD and when it is WAVED (Enforcement Decree, Table 2). Even with the same arm position, the direction of movement (up-and-down or back-and-forth) and the way the palm faces separate the stop, slow-down and reverse signals, so distinguish them one by one.
Answer: ③
Explanation
Under Enforcement Decree Appendix 2 item 6, to drive slowly you put the arm out, extend it 45 degrees downward and move it up and down, or flash the brake lights. Just holding the arm out in that position is the stop signal, and waving it back and forth with the palm facing backward is the reversing signal. To let the car behind overtake, you extend the arm horizontally and wave the hand back and forth.
Legal basis: 도로교통법 제38조 제1항, 시행령 제21조 별표2 제6호