Every day, tankers and trucks carrying flammable, toxic, or otherwise hazardous chemicals travel on public roads. Learning to recognise these vehicles, keeping a safe distance, and warning others are simple habits that can help prevent a serious accident.
The colourful diamond-shaped symbols fixed on a vehicle's body tell you what kind of chemical is inside. Learning to recognise them makes it much easier to judge the risk from a distance:
Can explode from shock, heat, or friction
Catches fire very easily
Harmful if inhaled, touched, or swallowed
Damages metal or skin on contact
Intensifies fire and burning
Carrying gas under pressure
These vehicles are designed to be recognisable from a distance, so you can be alert well before one gets close. If you see any one or more of the following markings, the vehicle is very likely carrying hazardous cargo, not ordinary goods:
Even if such a vehicle is stopped after an accident, its warning lights should keep flashing — so approaching traffic can still recognise it from a distance.
A tanker carrying chemicals behaves differently from an ordinary vehicle — it needs more room to stop, more space to turn, and can suddenly lose balance because of the liquid load shifting inside.
Keep a much larger gap than usual, so you have room to react safely if it brakes suddenly.
Avoid overtaking such vehicles near bridges, flyovers, or sharp bends.
Try not to stay parked directly beside or right behind one for long at a signal or in a jam.
If the tanker ahead is involved in an accident, stop your vehicle at a safe distance and wait — do not go closer to help. Wait for emergency responders.
Staying alert yourself isn't enough — part of this awareness is helping the people around you stay safe as well:
Use your headlights or horn to let the driver behind you know there's a hazardous vehicle ahead.
Point out these markings to family, neighbours, or classmates so they can recognise them on their own too.
Pay attention to roadside boards that read "Hazardous chemical vehicle in transit" or "Maintain safe distance."
If you spot such a vehicle near a school or hospital, keep children and patients well away from it.
In many places, vehicles carrying flammable or hazardous chemicals try to avoid busy school, college, and hospital hours (roughly 7 AM to 10 PM), moving instead late at night or before dawn on designated routes. Keep this in mind:
Stay especially alert to these vehicles when driving near highways or industrial areas at night or in the early hours.
Movement of these vehicles is generally meant to reduce during heavy rain, fog, or storms — but if you do see one, keep an even greater distance, since braking takes longer in these conditions.