In 1961 the HB load was specified in terms of units and varied depending on the class of road, with 45 units required for Motorways and Trunk Roads and 37.5 units for class i and class ii roads.Ī requirement for all public roads to be designed for at least 30 units of HB was introduced in 1973.īD 37/01 Appendix A of the Design Manual for Roads and Bridges says that Type HA loading is the normal design loading for Great Britain and adequately covers the effects of all permitted normal vehicles other than those used for abnormal indivisible loads. The Type HA uniformly distibuted loading was introduced in 1945 and the concept of a Type HA and HB load was included in the 1954 edition of BS 153: Part 3A.
The first standard vehicle load for highway bridges in the UK was introduced in 1922.īritish Standards introduced a traffic live load requirement in BS 153 Part 3 in 1923, which was later revised in 19.
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