Learner Theory Practise Questions
You may use hazard warning lights when
  a: driving on a motorway to warn traffic behind of a hazard ahead
  b: you are double parked on a two way road
  c: your direction indicators are not working
  d: warning oncoming traffic that you intend to stop
 
       
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Answer
a: The only other time you may use hazard warning lights is when you have broken down and are causing an obstruction.