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Report
Post-Implementation Travel Time Survey - Barrington Street to Innes Road Prepared for Christchurch City Council (Client)
This report has been prepared by Beca on the specific instructions of our Client. It is solely for our Client’s use for the purpose for which it is intended in accordance with the agreed scope of work. Any use or reliance by any person contrary to the above, to which Beca has not given its prior written consent, is at that person's own risk.
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Revision History
Revision Nº Prepared By Description Date
A Rohit Singh Draft Report for review 1 June 2011
B Rohit Singh Final Report 3 June 2011
Document Acceptance
Action Name Signed Date
Prepared by Rohit Singh
Reviewed by Marcus Brown
Approved by Melissa Foster
on behalf of Beca Infrastructure Ltd
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Table of Contents Executive Summary .................................................................................................... 2
Appendices Appendix A - Travel Time Survey Results
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Executive Summary
In May 2011, Beca Infrastructure Ltd. (Beca) were approached by the NZTA (acting on behalf of CCC) to conduct travel time surveys on the route consisting of Barrington Street, Whiteleigh Ave, Clarence Street, Straven Road, Idris Road, Glandovey Road, Heaton Street and Innes Road to assess the effects of changes made to the intersection approach and departure lane configurations within the Barrington Street / Southern Motorway to Idris Road / Glandovey Road section.
Post-implementation travel time surveys were organised on the selected route between Tuesday 24 May and Thursday 26 May 2011 (inclusive). Travel time and speed data from these dates has been compared to those observed during the corresponding days in April (Tuesday 4 April to Thursday 6 April 2011).
The survey involved one drive in each direction (northbound and southbound) of the route during the AM and PM peak periods on each of the three survey days. The start time throughout the survey period was fixed at 7:30 am for the morning peak and 4:30 pm for the evening peak.
Key survey results are detailed below:
Travel time: n Average northbound travel time on the Barrington/CSM to Idris/Glandovey route was reduced by
1 minute in the AM and 3 minutes in the PM peak periods. n Average southbound travel time on the Barrington/CSM to Idris/Glandovey route was reduced by
13 minutes in the AM and 1 minute in the PM peak periods.
Travel speed: n Average northbound speeds on the Barrington/CSM to Idris/Glandovey route increased by 4 kph
during both the AM and PM peak periods. n A significant increase was observed in average speeds in the AM peak in the southbound
direction from 16 kph in April to 28 kph in May. Average speeds in the PM peak in the southbound direction in April and May were observed to be similar.
Post-Implementation Travel Time Survey - Barrington Street to Innes Road
In February 2004, Beca Infrastructure Ltd. (Beca) were commissioned by Transit New Zealand, now the New Zealand Transport Agency (NZTA), to carry out travel time surveys on motorways and arterial routes in the Christchurch region. These surveys commenced in 2006 and were conducted during March and November each year, in order to be consistent and directly comparable with data collected in other major New Zealand cities.
The objectives of the Christchurch Travel Time Surveys are to:
n Gather accurate information about speed and travel times on State Highways and local arterials in the greater Christchurch region; and
n Provide data to give a realistic picture of congestion, speed and travel trends over time.
In addition to conducting the surveys, Beca were requested to prepare a travel time performance indicator to compare the performance of the Christchurch network against other cities in New Zealand and Australia. This performance measure, known as the Congestion Indicator (CGI), has been calculated in accordance with the methodology set out by the Ministry for the Environment1. The details of the Congestion Indicators are included in a separate Beca report titled ‘Christchurch Traffic System Performance Monitoring Report November 2010’
1.2 Background: Barrington Street to Innes Road Corridor Survey
The Canterbury earthquakes of September 2010 and February 2011 affected a large proportion of the Christchurch road network resulting in significantly increased congestion. Following the February earthquake and various subsequent communications between NZTA and Beca, it was decided to go ahead with the travel time surveys scheduled for March 2011. These were subsequently conducted during the first week of April 2011.
In addition to the usual routes, an additional route was surveyed at the request of Christchurch City Council (CCC) during April. This route consisted of the key north-south corridor consisting of Barrington Street, Whiteleigh Ave, Clarence Street, Straven Road, Idris Road, Glandovey Road, Heaton Street and Innes Road.
In May 2011, Beca were approached by NZTA (acting on behalf of CCC) to conduct travel time surveys on this route to assess the effects of changes made to the intersection approach and departure lane configurations within the Barrington Street / Southern Motorway to Idris Road / Glandovey Road section.
1.3 Purpose of this Report
This report describes the methodology adopted during the April 2011 (pre-implementation) and May 2011 (post-implementation) travel time surveys on the Barrington Street to Innes Road corridor and presents results from the same.
Travel time and speed information from May 2011 is reported, and this is compared with corresponding data collected in April prior to the implementation of changes along the route.
1 Jollands.N. (2001) Indicators of the environmental effects of transport – Travel-time indicator
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1.4 Report Structure
The structure of this report is given below:
n Section 2 describes the methodology used to undertake the travel time surveys. n Section 3 notes observations made during the survey period. n Section 4 presents summary travel time and speed results for the selected route. n Appendix A presents detailed travel time and speed data tables and shows comparison
between April and May 2011 data.
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2 Methodology
The following section describes the selected route and methodology used for conducting the travel time surveys. With the exception of the inter-peak survey which was not conducted in May, the methodology adopted remains unchanged from that used in the April 2011 surveys. This is expected to maintain consistency of data collected during the two surveys and to allow meaningful comparison and analysis.
2.1 Survey Route
The extent of the surveyed route is shown in Figure 2.1.
Figure 2.1: Survey route
The route comprises of the north-south corridor represented by Barrington Street, Whiteleigh Ave, Clarence Street, Straven Road, Idris Road, Glandovey Road, Heaton Street and Innes Road (to the intersection with Hills Road). This is a key corridor accommodating traffic between the south and north/north-west areas of Christchurch. The total length of the route is 10.4 km.
Key arterial roads traversed by this route include the Christchurch Southern Motorway, Blenheim Road, Riccarton Road, Fendalton Road, Rossall Street/Wairakei Road, Papanui Road and Cranford Street.
For ease of analysis, the selected route has been divided into 24 segments, as shown in Table 2.1.
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Table 2.1: Route segments
Segment No.
Length (m)
Road Name From To
1 772.8 Barrington St Cashmere Rd Studholme St 2 472.8 Barrington St Studholme St Milton St 3 469.1 Barrington St Milton St Wychbury St 4 467.2 Barrington St Wychbury St Heward St 5 400.4 Barrington St Heward St CSM (SH 73) West bound 6 246.0 Barrington St CSM (SH 73) East bound Lincoln Rd 7 583.0 Whiteleigh Ave Lincoln Rd Rail crossing 8 439.2 Whiteleigh Ave Rail crossing Blenheim Rd 9 452.0 Clarence St Blenheim Rd Peverel St 10 341.0 Clarence St Peverel St Riccarton Rd 11 264.9 Straven Rd Riccarton Rd Kilmarnock St 12 456.4 Straven Rd Kilmarnock St Rochdale St 13 369.1 Straven Rd Rochdale St Fendalton Rd 14 224.0 Idris Rd Fendalton Rd Brandor Rd 15 205.7 Idris Rd Brandor Rd Wroxton Tce 16 214.5 Idris Rd Wroxton Tce Glandovey Rd 17 387.2 Glandovey Rd Indris Rd Strowan Rd 18 392.6 Heaton St Strowan Rd Allister Ave 19 495.3 Heaton St Allister Ave Papanui Rd 20 784.4 Innes Rd Papanui Rd Rutland St 21 476.9 Innes Rd Rutland St Crandord St 22 521.1 Innes Rd Cranford St Nancy Ave 23 451.4 Innes Rd Nancy Ave Mahars Rd 24 489.2 Innes Rd Mahars Rd Hills Rd
While the whole route has been surveyed to maintain consistency with the April surveys, CCC have indicated that the section of specific interest lies between Christchurch Southern Motorway and the Idris/Glandovey intersection (highlighted sections 6-16 above). Summary results for this section are reported separately in Section 4, while detailed results for all sections are provided in Appendix A.
2.2 Data Collection Methodology
Travel time surveys were conducted using the floating car method, so that the data recorded represents the mean travel times of the traffic stream being measured. A GPS unit located within the survey vehicle was used to record travel time and speed information. The GPS unit records a trail of positions (x, y coordinates) and times recorded at 1-second intervals.
Data from each unit was uploaded to a computer at the completion of each day. The data was then analysed using Visual Basic macros to determine the closest survey point to each network node for each period to determine start/end times and to calculate the travel time and average speed for each road section listed in Table 2.1.
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2.2.1 Survey Dates
Travel time surveys were organised on the selected route between Tuesday 24 May and Thursday 26 May 2011 (inclusive). Travel time and speed data from these dates has been compared to those observed during the corresponding days in April (Tuesday 4 April to Thursday 6 April 2011).
2.2.2 Survey Start Times
The survey involved one drive in each direction (northbound and southbound) of the route during the AM and PM peak periods on each of the three survey days. The start time throughout the survey period was fixed at 7:30 am for the morning peak and 4:30 pm for the evening peak.
Unlike the April surveys, inter-peak travel time data was not recorded during the post-implementation travel time surveys.
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3 Survey Observations
Travel times across the network show a degree of natural variability and day to day fluctuations in speeds are considered typical. As part of the validation of the survey data, unusual circumstances are checked. Typically these results are kept as part of the survey database as they reflect this natural variability due to incidents, events, or weather.
The following is a brief description of key observations made during the May survey period.
3.1 Weather
The weather during the survey period was predominantly overcast but not rainy, except for Tuesday morning when fine weather was reported.
3.2 Factors Affecting Traffic Flow
Table 3.1 lists key observations regarding incidents which affected traffic as recorded by the traffic surveyor driving the route.
Table 3.1: Surveyor observations (May 2011)
Location Day/Period Observation
Barrington St – Ashgrove Tce to Conway Rd (900m section)
Tuesday 24 May AM and PM Road works – 30kph restriction
Glandovey Rd near intersection with Idris Rd
Tuesday 24 May AM Road works - no speed restriction
Whiteleigh Ave at traffic lights at entrance to Tower Junction car park
Tuesday 24 May PM Crash involving car on northbound carriageway. One police car in attendance. Caused brief delay.
Rail crossing on Whiteleigh Ave
Tuesday 24 May PM, Wed 25 May AM and PM
Transalpine train crossing caused delay
Barrington St, near Edinburgh St
Wed 25 May PM, Thurs 26 May AM
30kph restriction for approx 100 metres
Heaton outside Elmwood Park
Wed 25 May PM, Thurs 26 May AM and PM
Traffic cones narrowed the road east-bound and west-bound for approx 50 metres. No speed restriction.
While some of the incidents noted in Table 3.1 are expected to have an impact on travel times, these impacts are expected to be minor and as such do not require the route to be re-surveyed.
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4 Summary Results
The following section presents the travel time and speed information collected during the post-implementation (May 2011) surveys, and compares it to data from April 2011.
Detailed travel time and speed information by day and peak period for the selected route, along with comparisons with April 2011 data, is given in Appendix A of this report.
In addition, summary statistics showing the total travel time and speeds are presented below. These results have been reported for the following route sections:
n Complete route, as shown in Section 2.1. n Section of interest, between the Barrington Street/CSM and Idris Road/Glandovey Road
intersections.
4.1 Travel Times
Table 4.1 shows a comparison of total travel times in the northbound direction, by month, day and peak period, for the two route sections listed above..
Table 4.1: Northbound travel times
Complete Route Barrington/CSM to Idris/Glandovey
The figures shown in Table 4.1 indicate that PM peak travel times for this direction of travel far exceed those experienced in the AM peak. The comparison between the April and May data also shows that the post-implementation PM peak travel times along both routes showed significant reductions (more than 10 minutes for the whole route and between 5 and 10 minutes for the Barrington/CSM to Idris/Glandovey route) on Tuesday and Thursday, although a slight increase in travel time was observed during the Wednesday PM peak, which may have been caused by the delay experienced at the rail crossing.
On average, northbound travel time on the Barrington/CSM to Idris/Glandovey route was reduced by one minute in the AM and 3 minutes in the PM peak periods. Overall, AM travel times showed little variation from those observed in April.
The data for each section within the Barrington/CSM to Idris/Glandovey route shows definite improvements in travel on Barrington Street (between CSM and Lincoln Road) (AM and PM), Clarence Street (between Peverel Street and Riccarton Road) (AM) and Whiteleigh Ave (between Lincoln Road and Blenheim Road) (AM). The exception is Straven Road (between Kilmarnock Street and Rochdale Street) which appears to have experienced a slight increase in travel time across most days.
Post-Implementation Travel Time Survey - Barrington Street to Innes Road
In addition, significant reductions in travel time are observed on Heaton Street in the PM peak period.
Table 4.2 compares total travel times from April and May 2011 in the southbound direction, by day and peak period.
Table 4.2: Southbound travel times
Complete Route Barrington/CSM to Idris/Glandovey
The figures shown in Table 4.2 indicate that southbound AM peak travel times have reduced significantly as compared to April, with reductions of around 10 minutes observed for both routes. A large reduction in AM peak travel times is observed on Tuesday. This is likely to be a case of bad weather exacerbating traffic congestion on the morning of the Tuesday survey in April.
Southbound travel times in the PM peak do not show the level of reductions seen in the AM peak, and are observed to increase slightly on Thursday.
On average, southbound travel time on the Barrington/CSM to Idris/Glandovey route was reduced by 13 minutes in the AM and 1 minute in the PM peak periods.
The data for each section within the Barrington/CSM to Idris/Glandovey route shows definite improvements in travel on Idris Road / Straven (Brandor Road - Fendalton Road – Rochdale Street) (AM) and Straven Road (between Kilmarnock Street and Riccarton Road) (PM).
Significant reductions in travel time on Heaton Street and Glandovey Road are also noted in the AM peak period.
4.2 Travel Speed
Table 4.3 shows a comparison of travel speeds in the northbound direction, by month, day and peak period, for the two route sections.
Post-Implementation Travel Time Survey - Barrington Street to Innes Road
The changes in northbound speeds between April and May reinforce the trends observed in travel times in this direction.
On average, northbound speeds on the Barrington/CSM to Idris/Glandovey route increased by 4 kph during both the AM and PM peak periods.
Table 4.4 compares speed data from April and May 2011 in the southbound direction, by day and peak period.
Table 4.4: Southbound speeds
Complete Route Barrington/CSM to Idris/Glandovey
The figures in Table 4.4 indicate that the Barrington/CSM to Idris/Glandovey route has experienced more significant speed increases as compared to the complete route, with a higher observed level of variation in speeds as well. Thursday PM southbound speeds in particular show a decrease of around 7kph in May as compared to those in April.
On average, a significant increase was observed in AM southbound speeds from April (16 kph) to May (28 kph).
This corresponds to the large decrease in travel times observed during this period, as shown in Table 4.2. Little variation is observed in the average PM southbound speeds.
Appendix A
Travel Time Survey Results
Travel Times: Northbound AMApril May Difference April May Difference April May Difference April May Difference
Road Name From To Length (m) Tuesday Tuesday Tuesday Wednesday Wednesday Wednesday Thursday Thursday Thursday Average Average Average
Barrington St Cashmere Rd Studholme St 773 83 69 -14 79 67 -12 82 62 -20 81 66 -15
Barrington St Studholme St Milton St 473 82 42 -40 65 64 -1 41 36 -5 63 47 -15
Barrington St Milton St Wychbury St 469 39 36 -3 38 37 -1 37 38 1 38 37 -1
Barrington St Wychbury St Heward St 467 34 36 2 39 34 -5 37 35 -2 37 35 -2