"As police forces replace their road signs, ‘collision’ signs will replace those saying ‘accident’, as will visible messages on rear-facing in-car police notice boards. Blue ‘Police Accident’ signs are used by police at the roadside to warn road users to proceed with caution. Police forces across the UK will now be able to replace ‘Police Accident’ signs with ‘Police Collision’ signs, following approval from the Department for Transport (DfT). The change aims to reflect the preventable nature of most road crashes and promote greater accountability."
https://www.fleetnew...t-for-collision