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Road traffic collisions

A road traffic collision is an incident involving a vehicle, where a road user is injured and it reported to the Police within 30 days. 

Categories of injury

Killed/Fatality: Casualties who sustain injuries leading to death less than 30 days after the accident.

Serious Injury: Injury resulting in a person being detained in hospital as an in-patient, in addition all injuries causing: fractures, concussion, internal injuries, crushings, burns (excluding friction burns), severe cuts, severe general shock which require medical treatment, even if this does not result in a stay in hospital as an in-patient.       

Slight Injury: An injury of a minor character such as a sprain (including neck whiplash injury), bruise or cut which are not judged to be severe, or slight shock requiring roadside assistance. This definition includes injuries not requiring medical treatment.

Improving safety

The average value of prevention per injury collision, (or cost to society per collision) is approximately £99,300 (source: Department for Transport’s Transport Analysis Guidance (TAG) report ‘The Accidents Sub-Objective TAG Unit 3.4.1’).

Transport for Buckinghamshire’s method of identifying sites for potential casualty reduction remedial measures, involves reviewing injury collisions which have occurred within the last 5 year period, in order to identify those sites and routes that have the highest collision rate and casualty severity.

A search is carried out to identify collision cluster sites that have a history of 5 or more collisions (of any severity) within a 50m radius within the last 5 years. These sites are ranked using a prioritisation system of weighting casualties on a 3,3,1 scoring basis, for fatal, serious and slight, to ensure that the sites  with the highest level of KSIs (Killed or Seriously Injured) are investigated. The annual review typically identifies over 150 sites across Buckinghamshire: Transport for Buckinghamshire on average carry out remedial work at 10 sites per year. 

Collision Data

Members of the public are able to obtain basic collision data free of charge by visiting, if more detailed information is required then a charge will apply.

To acquire this information please use the ‘General Enquiry’ option on our contact us form.

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