Traffic volume data is used for road design changes, and the prioritisation of upcoming possible network improvements. The data provides trending information, and can help identify how effective improvements made in the past have been.
Traffic count data is also valuable for making road safety and temporary traffic management decisions, and scheduling renewal / resurfacing works.
Traffic count data is collected by Christchurch City Council for various key locations. This includes most controlled and signalised intersections, and link roads. Depending on the designation of the road or intersection, the counts will be done at periods of five yearly, three yearly, or two yearly. Special counts are also done as one-off events. In this case, the location may only have one count date shown.
For the traffic count data to be of any use, counts are not done during school or public holidays. Intersection counts are only done on Tuesdays, Wednesdays, or Thursdays. This is to ensure that a more accurate representation of traffic data is collected.
Intersection counts are only done to cover the busy periods of the day. These are typically from 7am to 8am, 8am to 9am, 2pm to 3pm, 4pm to 5pm and 5pm to 6pm. These times may differ to ensure that the peak traffic hours are collected.
Link counts are taken over a 7 day period, and are presented per day, per hour. The table will show Monday to Sunday, although the count data may have been collected starting any day of the week. Be sure to check the dates at the top of the columns.
State Highways are operated by the New Zealand Transport Agency (NZTA)(external link) who conduct their own link traffic counts. Council is not required to count traffic on these roads, although we do have some count sites. If count data is available, the road will show in the list.
NZTA intersections are counted as part of Council intersection count programme.
While all due care has been taken in the preparation and provision of this service, Christchurch City Council does not give any warranty that the information contained is accurate, and accepts no liability whatsoever for any loss or damage arising from the use of the data. People using the traffic count data should apply and rely upon their own skill and judgement when using the information, and consider the consequences arising from its use. The data should not be used in isolation from other sources of advice and information.
Please note that traffic flow counts are variable due to various external factors, e.g. sensitivity of equipment, counting methods used, congestion effects and seasonal variations. The traffic flow data is intended to be used as an indication of traffic volumes at counting sites.
Vehicles are counted by type and by movement over five hours on a single day.
Volume Counts are undertaken on a section of road and they count vehicles on that road and the direction of travel all day over a single week.
The Council monitors activity on around 6,000 intersections in Christchurch.