Mass limits

Single axles and single axle groups (one axle or two axles with centre of axle spacing less than 1m)

Description of axle or axle group Mass limit 
Single steer axle on a motor vehicle 6 tonnes
Single axle or single axle group fitted with single tyres with section width of:
(a) less than 375mm
6 tonnes
(b) at least 375mm but less than 450mm 6 tonnes
(c) at least 450mm 7 tonnes
Single axle or single axle group fitted with dual tyres on:
(a) a pig trailer
8.5 tonnes
(b) a bus licensed to carry standing passengers 10 tonnes
(c) any other vehicle 9 tonnes

Twin steer axle groups

Description of axle or axle group         Mass limit 
Twin steer axle group without a load-sharing suspension system 10 tonnes
Twin steer axle group with a load-sharing suspension system 11 tonnes

Tandem axle groups (at least two axles with the centre of axle spacing at least 1m but not more than 2m)

Description of axle or axle group Mass limit 
Tandem axle group fitted with single tyres with section width of: (a) less than 375mm 11 tonnes
(b) at least 375mm but less than 450mm 13.3 tonnes
(c) at least 450mm 14 tonnes
Tandem axle group fitted with single tyres on one axle and dual tyres on the other axle 13 tonnes
Tandem axle group fitted with dual tyres on:
(a) a pig trailer
15 tonnes
(b) any other vehicle 16.5 tonnes

Tri-axle groups (at least three axles with centre of extreme axle spacing at least 2m but not more than 3.2m)

Description of axle or axle groupMass limit 
Tri-axle group on a vehicle fitted with single tyres with section width of less than 375mm on all axles or single tyres on one or 2 axles and dual tyres on the other axle or axles 15 tonnes
Tri-axle group on a pig trailer with either single tyres with section width of at least 375mm, dual tyres on all axles or a combination of those tyres 18 tonnes
Tri-axle group on a vehicle, other than a pig trailer, with either single tyres with section width of at least 375mm, dual tyres, or a combination of those tyres 20 tonnes

Quad axle groups (at least four axles with centre of extreme axle spacing at least 3.2m but not more than 4.9m)

Description of axle or axle group Mass limit 
Quad-axle group fitted with single tyres with section width of less than 375mm 15 tonnes
Quad-axle group fitted with single tyres with section width of at least 375mm or dual tyres 20 tonnes

Other axle groups

Description of axle or axle group        Mass limit 
Any other axle group not specifically referred to in this schedule 20 tonnes

Axle groups fitted with complying road friendly suspension – (each axle group fitted with dual tyres)

Description of axle or axle group        Mass limit
Tandem axle group 17 tonnes
Tri-axle group 22.5 tonnes

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Last updated: 27 June 2017