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1. Cases where you must reduce vehicle speed when participating in traffic
According to Article 5 of Circular 31/2019/TT-BGTVT, drivers of vehicles participating in road traffic must reduce speed to be able to stop safely in the following cases:
- There are warning signs of danger or obstacles on the road;
- Changing direction of vehicle or limited visibility;
- Through level crossings; level crossings with railways; roundabouts; roads with winding terrain, steep passes; road sections with narrow, uneven surfaces;
- Crossing narrow bridges and culverts; passing through spillways, tunnels, underpasses; when going uphill or downhill;
- Through areas with schools, hospitals, bus stations, public works with large concentrations of people; densely populated areas, factories, offices located along the road; areas under construction on roads; traffic accident scenes;
- When there are pedestrians or wheelchairs of disabled people crossing the road;
- There are animals walking on the road or grazing close to the road;
- Avoid vehicles going in the opposite direction or when allowing vehicles behind to overtake; when there is a turn signal or emergency signal from the vehicle in front;
- Approaching a bus stop or parking lot where passengers are getting on or off the bus;
- Encountering priority vehicles on duty; encountering oversized vehicles, overweight vehicles, vehicles carrying dangerous goods; encountering pedestrians;
- Rain; fog, smoke, dust; slippery, muddy road surface, lots of rocks, soil, and scattered materials;
- When driving a vehicle through the vehicle load control station, traffic police station, or payment transaction station for vehicles using the road.
2. Maximum speed of vehicles in traffic
2.1 Maximum speed allowed for motor vehicles in densely populated areas (except highways)
Road vehicle type | Maximum speed (km/h) | |
Dual carriageway; one-way road with two or more motor vehicle lanes | Two-way street; one-way street with one lane for motor vehicles | |
Motor vehicles, except those specified in section 2.3 | 60 | 50 |
2.2 Maximum speed allowed for motor vehicles participating in traffic outside densely populated areas (except highways)
Road vehicle type | Maximum speed (km/h) | |
Dual carriageway; one-way road with two or more motor vehicle lanes | Two-way street; one-way street with one lane for motor vehicles | |
Passenger cars, passenger cars with up to 30 seats (except buses); trucks with a load capacity of less than or equal to 3.5 tons | 90 | 80 |
Passenger cars with more than 30 seats (except buses); trucks with a load capacity of more than 3.5 tons (except tank trucks) | 80 | 70 |
Buses; tractors pulling semi-trailers; motorcycles; special-purpose vehicles (except mortar mixers and concrete mixers) | 70 | 60 |
Trailer trucks; tractor trucks; mortar mixer trucks, concrete mixer trucks, tanker trucks | 60 | 50 |
2.3 Maximum speed allowed for specialized motorbikes, motorbikes (including electric motorbikes) and similar vehicles on roads (except highways)
For specialized motorbikes, motorbikes (including electric motorbikes) and similar vehicles when participating in traffic, the maximum speed is not more than 40 km/h.
2.4 Speed of motor vehicles and specialized motorbikes on highways
- The maximum speed allowed for operation on the highway does not exceed 120 km/h.
- When participating in traffic on the highway, drivers and specialized motorbike operators must comply with the maximum and minimum speeds indicated on road signs and road markings on the lanes.
Legal basis: Articles 6, 7, 8, 9 Circular 31/2019/TT-BGTVT.
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