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RE: AASHTO Loadings

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Thor -
 
The AASHTO MS-18 truck is the metric version of the standard HS20 truck.
 
The loads and axle spacings are
 
Front Axle:  35,000 N
Center Axle:  145000 N
Rear Axle 145000 N
Front Axle to Center Axle distance:  4300 mm
Center Axle to Rear Axle distance:   variable from 4300 mm to 9000 mm ( to produce maximum stress),
(even though the short axle spacing almost always controls.
 
Hope this helps.
If you need it, the AASHTO MS-23 truck is the metric version of HS25, simply increase the above loads
by 25%, but keep the same axle spacing.
 

Daniel Mayo