What is the exact coverage of HA loading?

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Type HA loads first appeared in 1945 and the concept of HB load was
introduced in BS 153 in 1954. Type HA loads is the normal loading for
United Kingdom and covers vehicles up to 44 ton. HA loads are
represented by a uniformly distributed load with a knife edge load. HA
loads have covered the following situations:

(i) More than one vehicle occupying the width of a lane;
(ii) Overloading in normal vehicles;
(iii) Impact load induced when car wheel bounce when traveling
crossing potholes.

This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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