Learn the right way to place warning triangles at least 150 m behind a stopped vehicle on highways to stay safe and avoid fines up to VND 14 million. Read more now.
When a vehicle breaks down or encounters an emergency on a highway, the instinct is to pull over, turn on hazard lights, and continue on. However, many drivers overlook a critical safety step: placing a warning triangle at a sufficient distance behind the stopped vehicle. Failing to do so not only endangers other road users but also violates traffic regulations that can result in hefty fines and points on your driver’s license.
What the Law Says
According to Vietnam’s Decree 168, any driver who stops on a highway must set a warning triangle (or other reflective device) at least 150 metres behind the rear of the vehicle. The rule applies whether the vehicle is in a designated emergency lane or pulled over to the side of the road. Non‑compliance attracts a fine ranging from VND 12 million to VND 14 million and a deduction of six points from the driver’s licence.
Why 150 Metres?
Highways are high‑speed environments. A car travelling at 120 km/h covers roughly 33 metres per second. At that speed, a driver needs enough time and distance to notice a warning triangle, react, and safely adjust speed. Placing the triangle less than 150 m away gives following drivers insufficient warning, dramatically increasing the risk of chain‑reaction collisions.
Quick calculation
- Speed: 120 km/h = 33.3 m/s
- Typical reaction time: 2 seconds
- Distance covered in reaction time: 66.6 metres
- Additional buffer for safe braking: ~80 metres
Combined, these figures justify the 150‑metre minimum – it provides a clear visual cue and enough space for safe deceleration.
Common Mistakes Drivers Make
- Only turning on hazard lights – lights are visible only from a short range, especially in adverse weather.
- Setting the triangle too close to the vehicle – many think a few metres are enough, which defeats the purpose.
- Neglecting reflective devices like reflective vests or cones when a triangle isn’t available.
- Parking in the emergency lane without authorization – this is a separate violation that can attract additional penalties.
Step‑by‑Step Guide to Properly Use a Warning Triangle
- Park safely in the designated emergency lane or at the roadside, away from traffic flow.
- Activate hazard lights to alert nearby drivers instantly.
- Exit the vehicle carefully and move opposite the flow of traffic.
- Carry the warning triangle at arm’s length and place it at least 150 metres behind the rear bumper. If the road is curved or visibility is reduced, increase the distance.
- If you have reflective cones or a high‑visibility vest, use them in addition to the triangle for maximum visibility.
- Stay behind the vehicle until help arrives or you are advised it is safe to re‑enter traffic.
Potential Consequences of Non‑Compliance
Beyond the monetary fine and licence points, failing to properly signal a breakdown can lead to:
- Severe multi‑vehicle accidents, especially during peak traffic hours.
- Legal liability for injuries or property damage caused by the oversight.
- Increased insurance premiums after a claim is filed.
Final Takeaway
Setting a warning triangle correctly is a simple, low‑cost action that saves lives and protects drivers from costly penalties. Remember the 150‑metre rule, keep a triangle in your vehicle, and make safety your top priority whenever you’re forced to stop on a highway.