Vincent Teo (a) The policeman is guiding / controlling/ instructing / patrolling / arranging the traffic. "controlling" only - Edit. (sometimes "instructing") (b) The policeman is on / at / in the traffic.
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Vincent Teo(a) The policeman is guiding / controlling/ instructing / patrolling / arranging the traffic. "controlling" only - Edit. (sometimes "instructing")
(b) The policeman is on / at / in the traffic. in the middle of traffic.
(c) The policeman is helping the traffic to go on. helping to clear the traffic.
(d) T