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Data & research

London Road Safety Unit

Glossary

This glossary includes some of the most commonly-used terms in collision and casualty reporting, used throughout the data and research section of this website. Clicking on a term below will reveal an explanation of that term.

Built-up roads |

Collision |

Casualty |

Darkness

From half an hour after sunset to half an hour before sunrise, i.e. "lighting-up time".

Fatal collision |

Goods vehicles |

Heavy goods vehicles |

Light goods vehicles |

Medium goods vehicles |

Other vehicles |

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