Large urban areas are facing an increasing challenge of mobility (congestion), safety and environmental impacts due to traffic incidents.
Traffic incidents are estimated to account for about 25% of traffic congestion and bad weather another 15% (FHWA 2007). Hence congestion due to traffic incidents and bad weather can be as much as 40% of the total congestion.
Traffic incidents can have significant impacts on road users and the community. Injured people need to be recovered quickly from crashes and the potential for secondary incidents needs to be avoided. The safety or emergency responders and traffic controllers are at risk in moving traffic conditions.