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a Or as otherwise required in the DMRB or specified by the relevant authority (in accordance with the road classification if applicable).

Annex Y (normative)

Fatigue load models for highway bridges

ENV 1991-3:1995 requires that the relevant authority defines the traffic category for the bridge. Unlike in the British Standard, no guidance to designers is provided on this in ENV 1991-3:1995. In applying ENV 1991-3:1995, the following shall be used.

Typical traffic flow models for use on UK primary routes are given in Table Y.1.

Table Y.1 — Typical traffic flow models for use on UK primary routes

Road type

Number of lanes

Traffic category

Number of slow lanes

Inter-urban

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