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Abnormal Load

General Provisions

An AIL (Abnormal Indivisible Load) is any load that cannot be broken down into smaller loads for transport without undue expense or risk of damage, an example of such a load would be a 180 tonne transformer. Whereas an articlulated vehicle carrying a normal load can reduce the weight of the load by removing part of it and redistributing the remainder, this is not the case of an AIL.
An AIL is also any load that exceeds certain parameters for weight, length, and width, wherupon the vehicle carrying the load would not comply with Construction and Use Regulations due to the weight of the load exceeding 44,000 kgs; or as a result of the width and/or length of the load dictating that it can only be carried on a heavy motor car, trailer or combination of both where the same would not comply with the Construction and Use Regulations in all respects.

AIL's are a complex subject due to the regulations that affect them. This section merely gives a brief insight into AIL's and there carraige.

Special Types Rules
The Special Types rules permit:

These rules are contained in section 44 of the Road Traffic Act 1988 and the Motor Vehicles (Authorisation of Special Types) General Order 2003 (STGO). Only AIL's may be carried under these rules. Information pertaining to section 44 can be found on the Section 44 page within this section.
Rules governing Weights and Dimensions are to be found in section 41 of the Road Traffic Act 1988.

Vehicle Categories and Weights
Vehicles are classified into three groups according to total laden weight. Current categories are set out below with their related axle weights and spacings. A vehicle can be used in any category provided it meets all the conditions of that category. An empty vehicle can travel in a different category when unladen.
The maximum gross weights for the three categories are:

Category Maximum GVW (kg) Maximum category
gross weight
Maximum Axle Weight
D x 7,500
D x 12,500
50,000 kgs
80,000 kgs
150,000 kgs
11,500 Kgs
12,500 Kgs
16,500 Kgs

In the table above, D is the distance (measured in metres) between:

Category 1 vehicles or combinations must have, at least, six axles. However Category 1 articulated vehicles up to 46,000 kgs may have five axles.

Indivisible loads which are abnormal only in respect of their dimensions and not their weight may be able to be carried on standard vehicles subject to the construction and use regulations. However, it must be noted here that loads wider than 4.3 metres cannot be carried under Construction and Use Regulations and all movements where a load wider than 4.3 metres must comply with STGO rules.

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