Approximately one third of all road accidents are estimated to be work related, this suggests that in Great Britain 610 people were killed, and 7500 were seriously injured, in work-related road collisions in 2010. (1)
1. Department for Transport - Reported Road Casualties in Great Britain: 2010 Annual Report
"In 2010, there were 1,850 people killed and 22,660 were seriously injured."