WSP's Auckland Laboratory has the capability to carry out testing to TNZ Technical Memorandum 7003. We are able to provide quality control testing and random verification testing (RVT).

How does it work?

The rear ‘live’ axle and the body of the vehicle are linked.

As the axle moves over the surface of the road and the movement relative to the vehicle body is accurately measured along with speed and distance.

The degree of roughness can then be calculated for each 100 metres of road, which is then related to the International Roughness Index, or NAASRA counts if preferred. For short roads or RAMM purposes, readings can be obtained for every 20 metres with a 100 metre rolling average.

Results may be presented in a hard copy tabular form or electronically for insertion into the RAMM database.



  • RAMM surveys
  • Area-wide treatment surveys
  • New pavement surveys
  • Construction checks
  • Random verification checks
  • Diagnoses of suspect pavemen