Average Speeds of the cars.

"In the second half of 2007 a speed board was installed on the highway heading south at the
point where the road slopes down towards Centennial Highway. Transit New Zealand has
recorded speeds before the speed board was introduced and for three separate periods after it
was introduced.
The following figures summarise the information of recorded speeds before the speed board
was introduced and for a period in December 2007, when the speed board had been in
operation for three months.

Speeds recorded between 27 July 2007 and 3 August 2007 were as follows:
- Average Speed 58km/h
- 85%ile Speed 61km/h
- % above 92.44%

Speeds recorded post speed board installation between 4 December 2007 and 21 December
2007 were as follows:
- 1 Average Speed 57km/h
- 2 85%ile Speed 59km/h
Although the speed board seems to have had some impact, average speeds are still well above
the limit of 50km/h."

http://www.pukeruabay.org.nz/community/PukeruaBayNAP.pdf
Transit New Zealand, PowerPoint presentation