Why 2008 was Great for Road Safety in Vietnam

X Axis - Millions of registered motorbikes
Y Axis - Number of Road Traffic Accident Fatalities

Usually, an increase in the number of vehicles on the road would mean a higher number of expected fatalities.

The impact of Vietnam's helmet law can be seen in the decline in the number of RTA fatalities despite an increase in the number of motorbikes.

Data comes from the National Traffic Safety Committee