Road	Role / function	How it's used	Why a speed reduction has been proposed over other measures
Waimakariri Road	Peri-urban Roads, provide connection to properties.	Residents accessing their properties and school children accessing Harewood School.	Speed limit change being used to supplement other safety interventions.
Whitchurch Road	Peri-urban Roads, provide connection to properties.	Residents accessing their properties and school children accessing Harewood School.	Speed limit being changed to align with Waimakariri Road. No other speed management interventions required.

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Data sources:

Existing speed limit	NZTA National Speed Limit Register
Proposed speed limit	Consultation
Number of crashes in the last five years	NZTA Crash Analysis System
Estimated reduction in the number of crashes each year	Calculated using the NZTA Optional Cost Impact Analysis Tool
Current average operating speed	TomTom traffic data
Estimated average operating speed when new speed limit is in place	Calculated using the NZTA Optional Cost Impact Analysis Tool
Estimated impact on individual travel time	Calculated using the NZTA Optional Cost Impact Analysis Tool
Estimated impact on collective travel times	Calculated using the NZTA Optional Cost Impact Analysis Tool

Additional notes:

• The estimated impacts in the cost benefit disclosure statement are based on the assumption of no growth in daily traffic volumes.
• The implementation cost reflects the cost of installing speed limit signs around the edge of each speed limit zone.