Roads rated as medium to low risk

South Canterbury roads have received a medium to low risk assessment in a nationwide analysis of safety ratings.

KiwiRAP (New Zealand road assessment programme) measures crash risk on nearly 11,000 kilometres of state highway, identifying high-risk roads to help target safety improvements.

It operates under the umbrella of the international road assessment programme (iRAP) which works in partnership with 70 countries and recommends design improvements that need to be implemented in order to save lives and reduce the number of serious injuries on the roads.

The New Zealand Transport Agency, Automobile Association, Transport Ministry, ACC and police all contribute to the risk maps.

The programme consists of three protocols - risk mapping, which uses historical traffic and crash data to produce colour-coded maps, performance tracking, which compares crash rates over time, and star rating, which involves road inspections to analyse engineering features.

For the purposes of displaying the safety risk of the state highway network, KiwiRAP looks at two different measures of risk - collective risk and personal risk, and compares 2007-2011 data to 2002-2006 data.

South Canterbury ranked medium to low-medium in the assessment.

State Highway 8 had the most significant change, moving from low to medium in the personal risk assessment.

State Highway 1 between Timaru and Oamaru and between Ashburton and Timaru ranked the highest in terms of risk to personal and collective safety. Both received a medium risk band.

Personal risk is a measure of the risk to each individual using the state highway being assessed and takes into account traffic volumes on each section of highway. Collective risk is measured in terms of the number of crashes per kilometre of state highway.

The Timaru Herald