Our research will deliver a better understanding of the significance of noise from individual vehicles compared to average levels from steady traffic, and how road layout features influence noise generation. We will establish a consistent framework for monitoring, assessing, and predicting individual vehicle noise and other nuisance noise. This framework will assist Waka Kotahi to assess projects and design elements on a consistent basis. This framework will also allow for the implementation of appropriate interventions to reduce effects.
The result of this improved understanding and assessment framework will be to more effectively evaluate and design roading features, such that noise effects will be reduced. The reduced noise effects will result in improved amenity for residents near roads, and a reduced risk of health effects from road-traffic noise, particularly sleep disturbance.
The end goal of our research is to provide Waka Kotahi and the wider community with better knowledge and tools resulting in is reduced harm and a better living environment for people adjacent the state highway network.
The first objective of our research is to summarise known issues of noise from engine braking, and vehicles driving over bridge joints and Audio Tactile Profile (ATP) linemarking. This objective will yield an understanding of the prevalence and effect of these noise sources. This will largely be performed by a meta-analysis of existing NZ studies, and will be supplemented with the measurement results in this research project. The primary mechanisms resulting in these noise events are understood, but the evidence needs to be collated and formalized to inform decisions and policy.
The second objective of our research is to address the lack of standardized approaches for predicting the level or impact of sounds from individual vehicles and sound arising from surface features. We understand that this research should address noise from vehicles traversing road design features such as:
- intersections (controlled and uncontrolled)
- traffic calming devices
and noise from road surface features such as:
- bridge joints
- surface joints
- rumble strip (ATP linemarkings)