Directional signals must be given:

When in city traffic only.
Only when there is traffic to the rear of your vehicle.
When there is other traffic in sight.
When changing directions or suddenly reducing speed.
Explanation

Drivers must use their turn signals when changing lanes, turning at intersections, pulling off roads or away from curbs. Never stop or suddenly slow down without signaling your intentions to other drivers. Your signal alerts other motorists to your actions and gives them time to react. Failure to signal is extremely dangerous.

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