Thailand has one of the highest rates of road traffic deaths in the world, but its capital, Bangkok, faces a severe shortage of ambulances.

The gap is filled by thousands of informal ambulances run by volunteers.

These emergency responders race to accident scenes in modified vans and pick-up trucks outfitted with stretchers.

Rival volunteer crews compete to reach victims first, and territorial conflicts can sometimes become deadly.

101 East meets the Thai front-line workers risking their lives to save strangers.