Three workers from the "Road Infrastructure" Agency (API) were hit by a 69-year-old driver while clearing bushes at the fifth kilometer of the Botevgrad ring road in the direction of Sofia, the Ministry of Interior told BTA.
All three were taken to hospital, with the oldest - 50 years old, in serious condition.
The driver drove through safety cones, hitting the three workers and another car. The incident occurred at around 1:30 p.m.
Traffic is regulated by the "Traffic Police".