# Deflection limits for bridges

### AASHTO 8th

**Clause 2.5.2.6.2** of *AASHTO LRFD Bridge Design Specification 8th Edition* recommends the following deflection limits:

Traffic only |
\(L/800\) |

Traffic + pedestrian |
\(L/1000\) |

Traffic on cantilever arms |
\(L/300\) |

Traffic + pedestrian on cantilever arms |
\(L/375\) |

where \(L\) is the span length.

### BS 5400-3:2000

**Clause 5.7** of *BS 5400-2:2000 Code of practice for design of steel bridges* recommends that, for aesthetic purposes, a bridge should not sag more than \(L/800\) below horizontal (i.e. \(L/800\) plus any precamber) where \(L\) is the span length.