You're Driving On A Motorway And Have To Slow Down Suddenly Due To A Hazard Ahead. How Can You Warn Drivers Behind Of The Hazard? / driverly

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You're driving on a motorway and have to slow down suddenly due to a hazard ahead. How can you warn drivers behind of the hazard?

Switch on your hazard warning lights

Switch on your headlights

Sound your horn

Flash your headlights

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