Brynderwyns Data Presentation
Olivia Scott
Spatial settings of significant areas to the Brynderwyn Detours
Included on the slides: Brynderwyns, detour overview, Dargaville, Paparoa, Kaiwaka, Mangawhai and Waipu
Detours Overview
There are three detour routes that a person can take around the Brynderwyns: the longest route, approximately 135 km long, uses state highway 14 from Whangarei to state highway 12 through Dargaville and papamoa and back onto state highway 1 at Brynderwyns, this route is the route that HPMV (High Productivity Motor Vehicles) must take. The second longest detour route, approximately 82 km long, uses Oakleigh road from Oakleigh to Paparoa and then uses state highway 12 and then back onto state highway 1 at Brynderwyns. This route does not allow HPMV, only trucks of under 44,000 kgs and other vehicles are permitted to use this detour. The final shortest route, approximately 37 kms, is the detour from Waipu to Kaiwaka using mainly Cove road and Kaiwaka Mangawhai Road. This route is not permitted for trucks with trailers and only allows light vehicles.
135 km
82 km
37 km
Spatial setting of the Brynderwyns
Aerial photos of the brynderwyns
Natural features
Cultural features
Google street view of Brynderwyn State highway 1 section
The closure and repairs
The Brynderwyns were damaged after Cyclone Gabrielle in 2023, extensive repairs and work is needed to return this road to its condition before the Cyclone. The Brynderwyn Hills are closed from SH1/ SH12 intersection on the south side to the bottom of the hill on the north side.
What Fulton Hogan is doing:
Spatial setting of Dargaville
Brynderwyns detour
Satellite view of Dargaville
The town of Dargaville is located to the west of Whangarei and is north of Auckland. Its economy is supported greatly of farms for: beef, dairy, pine plantations and Kumura
Traffic count area
Interview area for two of the Dargaville businesses
Real estate Business interview
State highway 12
Data collection area
Collection areas
Spatial setting of Paparoa
Detour through oakleigh road
Detour through Dargaville for HPMV
Location of business we interviewed
Location of traffic count and road evaluation
Paparoa is a small town located south of Dargaville and to the west of Mangawhai it is also on the cross roads of two detours.
Spatial setting of Kaiwaka
State highway 1 south of detours
Detour through Papamoa and dargaville
Detour via Mangawhai
Location of business we interviewed
Location of traffic count and road evaluation
Kaiwaka is located south of the Brynderwyn road closure.
Location of traveller we interveiwed
Spatial setting of Mangawhai
Unfortunately, due to time restrictions, we only had enough time to do the road evaluation and traffic count. We couldn't interview any businesses in Mangawhai.
Cove road detour
Road evaluation and traffic count area
Spatial setting of Waipu
Locations of businesses we visited
Road evaluation and traffic count
Way back to Mangawhai on detour
Way onto State Highway 1 from detour
Waipu is located approximately 500 metres off state highway 1 above the Brynderwyn road closure.
Graphs depicting data from field trip
Included on the slides: Brynderwyns, detour overview, Dargaville, Paparoa, Kaiwaka, Mangawhai and Waipu
Graphs depicting data from Business questionnaire
This graph shows the different answers to the question “what effect does the Brynderwyn road closure have on your business?” With the options being Positive, Negative and no effect. This shows that 4 out of 9 businesses have seen a positive effect from the Brynderwyn road closure, 3 out of 9 businesses have seen a negative effect and 2 out of 9 businesses have noticed no effect from the Brynderwyn road closure. The majority of the businesses(44.4%) have noticed a positive effect from the Brynderwyn road closure. As the majority of the towns we visited were on a detour the increased traffic along those roads and through those towns is likely to have caused this overall positive affect.
This graph depicts the effect of the Brynderwyn road closure on specifically Waipu businesses. As the majority of our business questionnaires were filled out at Waipu there was enough data to create a graph from it. Negative and no effect have the same value and are the two highest ones. This shows that businesses in Waipu mainly notice negative effects or no effect at all. When interviewing one of the businesses from Waipu they explained that some of their employees had to take the much longer detour route to work, this along with the three businesses that stated it was more difficult to import stock/ingredients, are likely to be the reasons they claimed a negative effect. The benefit of increased customers did not out way the costs of theses effects.
This graph depicts the data from the questionnaire, question 5 “Is it more or less difficult to import stock/ingredients for your store since the road closure?” 5 stores have said that it is more difficult to import stock and ingredients whilst 4 stores have said that there has been no change. This shows that the majority of the shops along the detour routes have felt that it has been more difficult to import stock. This specific effect is one that may have contributed to the overall negative effect some businesses have felt. There are more businesses that found it difficult to import stock then there were that felt aa overall negative effect, this means that some businesses thought that the cost of importing stock did not outweigh the benefit of increased customers and traffic.
This graph depicts the answers from question 3 of the business questionnaire “Has your establishment had an influx of more customers since the Brynderwyns road closure?” 4 businesses have seen an increase in customers, 2 have seen no change, and 3 have seen a decrease. No businesses have seen a large increase or decrease. The highest point of this graph is the increase bar with 4 businesses. This shows that the majority of businesses have had increased amounts of customers. This specific effect could be one that contributed to the overall positive effect that many businesses saw. I expected an increase of customers in; Dargaville, Papamoa and Waipu, as theses towns are located along the roads of the closure. Theses numbers correlate exactly with the numbers of the overall effect graph, this shows a direct relationship between the increase of customers and whether or not a business feels a negative or positive effect.
Graphs depicting traffic related data
This graph depicts the total types of traffic across all detour routes. The highest point on this graph is the car bar with a value of 197. The lowest point on this graph is the motorbikes with a value of 4. The cars on all routes make up the large majority of the traffic. The cars were more than 150 larger than any other bar. This shows clearly that the cars were the most common vehicle across all detour routes. This is expected as cars are allowed on all the detours and are the most common personal vehicle.
This graph shows the number of trucks in the different towns of the detours. The highest amount of trucks was 14 in Kaiwaka with the lowest number of trucks being in Mangawhai with 2. The second highest number of trucks occurs in Dargaville. This is expected as Kaiwaka is the town south of the closure where all the detour routes filter into. This means that all trucks going north will first go through Kaiwaka before going onto a detour and that if trucks are coming back south they will all go through Kaiwaka no matter what detour they go on. The second highest number of trucks was Dargaville, this is very expected as Dargaville is the detour that is suggested for heavier trucks and the HPMV must travel this route.
This graph depicts the different traffic types on the towns of the detours. This shows that the town with the most traffic was Dargaville and the town with the least amount of traffic was Papamoa. This means that Dargaville is likely to be the most popular route. This was unexpected because i thought that people would prefer a shorter route.
Traffic type and amount in different towns
This graph depicts the scores we gave each road of the detours. This shows that the Kaiwaka road had the overall highest score of 19 and therefore the best road. The lowest score of 15 is Mangawhai road which means that road had the overall lowest quality. Kaiwaka is located on state highway 1 and is traveled through with or without the closure. This means that Kaiwakas road is already able to withstand high amounts of traffic, this is why Kaiwaka has the highest road score. The low quality of the Mangawhai road may be a reason that contributes to Dargaville being the most popular route.
Secondary Data
Secondary data links
Fulton Hogan Presentation, has information on the machinery, environmental controls and useful numerical data: Brynderwyns School Presentation BOI.pdf
Hochstetters frog information:
600 Hochstetter’s frogs rehomed during Brynderwyn road works - NZ Herald
Information on detours and detour map:Detours and dates confirmed for SH1 Brynderwyns closure in Northland - NZ Herald
Information on detours and the preparation work: https://createsend.com/t/t-EA298AF21DA02AC02540EF23F30FEDED
Information of the brief open period for Easter as well as Northland businesses: /news/business/northland-business-owners-offered-free-mentoring-after-sh1-brynderwyn-closure
Information on the national truck businesses and Northland businesses: nzherald.co.nz/sh1-brynderwyns-closure-truckies-angry-over-taking-the-long-way-to-northland/