Emergency warning triangles are just one item to help alert traffic, and other drivers including all road users that they should be aware of something ahead. It is an equilateral (equal-sided) triangle, of around 600 mm in size made of red reflective material. Anyone can put it on the side of the road to warn other drivers and other road users of a breakdown or crash ahead.
Furthermore, It applies to all vehicles. If a vehicle brakes down on any portion of a public road, it is very necessary to place a triangle on the roadway at least 45 m from the back of the vehicle, facing traffic approaching from the rear.
First and foremost, Place the first device on the traffic side of the vehicle 10 feet (4 paces) from the front or rear, depending on traffic direction.
and the second device ped 100 feet (40 paces) behind the vehicle.
Also Place them on the side of the road where they are visible to other motorists and other road users.
However, If you breakdown on a carriageway you should put a warning triangle on the road behind and in front of your broken-down vehicle on the same side of the road.