Marlborough District Council Roading Assets - Activity Management Plan 2015 - 2018 SECTION 1 EXECUTIVE SUMMARY Sealed road condition assessments have been undertaken annually to this date. Considering the veracity of the data and the reasonably steady state of the pavement model, full condition assessments will now be undertaken only every second year on all sealed roads. 1.13.2.2 Road Roughness Surveys The programme for measuring roughness is highlighted in Table 13.2.5 of this section. The results of the survey are expressed in terms of NAASRA counts, a Smooth Travel Exposure Index is also calculated by the NZTA annually comparing the road roughness on each road or section of road with the proportion of travel on roads or sections of road classified as smooth by the NZTA. All equipment used to measure road roughness is required to be calibrated appropriately. 1.13.2.3 Pavement Deterioration Modelling This process has been introduced in Section 5.3.2, Asset Management Practices, and discussed in detail with specific regard to the sealed pavement deterioration in Section 6.1 Sealed Pavements. Council utilises the Deighton’s Total Infrastructure Management System (dTIMs) system with predictive modelling functionality. A pavement deterioration model has been developed for the network utilising the dTIMs software package and the HDM-4 deterioration model. The results currently being obtained are reasonably consistent with the existing levels of renewal expenditure and suggest that the current maintenance and renewal strategies are appropriate for the network. The network has been modelled on an annual basis, however with the model proving to be reliable and producing consistent results in line with actual performance in the field, this process is to only be done every second year from this date. 1.13.2.4 High Speed Data Survey Council has taken the opportunity over the last few years to engage the High Speed Data vehicle operated by WDM Ltd in conjunction with the NZTA when they are surveying the adjoining State Highway network. This is a state of the art vehicle with a multitude of sensors reading the condition of the road surface as it passes over at normal road speeds. This vehicle has completed surveys of roads carrying over 500 vehicles per day and enables good correlation with the other road roughness survey completed on those roads. Information surveyed includes; Rutting Roughness Texture Equilibrium SCRIM Coefficient; measuring skid resistance Video images These results are able to be used to measure the Network Performance Measures specified in the maintenance contracts. 1.13.2.5 Pavement Monitoring Programme The processes discussed above are completed at predetermined intervals to allow for analysis and review prior to various reporting and funding submission rounds. Performance Monitoring 14/15 15/16 16/17 17/18 18/19 19/20 20/21 Pavement Condition Assessment Roughness – All Roughness – > 500vpd Prepare / review AMP Transport Investment On-line dTIMs Modelling (Recommended) *to be confirmed * * 30 September 2014 Page 175 of Section 1