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A426 Stockton Crossroads ACCIDENT INVESTIGATION REPORT

Carolyn Burrows B’SC MIHT Team Leader – Road Safety Engineering Road Safety Unit Warwickshire County Council

27 November 2012

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Accident Investigation Contents:1.0

Introduction

(3)

2.0

Accident Analysis

(4)

3.0

Findings

(16)

4.0

Conclusions

(18)

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Accident Investigation 1.0

INTRODUCTION

Warwickshire County Council is committed to reducing casualties resulting from road collisions against Government targets. By examining the accident data, those locations that appear to have the highest number of recorded injury accidents are identified. A study is then instigated by the Road Safety Engineering Team to analyse a specific location or length of road, identify collision patterns, and indicate how these patterns could be addressed.

1.1

LOCATION

The crossroads junction of the A426 Southam Road and two minor roads from Napton Road and Stockton Road, is situated in a rural location in the District of Stratford upon Avon.

1.2

DATA

The accidents reviewed relate only to those accidents that resulted in personal injury (Personal Injury Accidents (PIA’s). The figures have been collated from Warwickshire County Councils data sheets, which are derived from the Warwickshire Police Authority’s Stats 19 report forms.

2.0

ACCIDENT ANALYSIS

10 Personal Injury accidents* (PIA’s) have been recorded in the last 5 years and 10 months (2007 to end October 2012) resulting in 14 casualties. The data for these accidents is appended hereto at Appendix B. *Data excludes recent accident 5th November 2012. 2.1

Site Description This crossroads junction is situated in a rural location to the north east of Southam. The crossroads is located on the outskirts of the village of Stockton, and forms and intersection between the A426 and the C33.

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Approx 1.5miles to the north west of the crossroads on the C33, is the village of Long Itchington. The C33 is used as a local route between the villages of Long Itchington and Stockton. The A426 Southam Road is the predominant through route. Both approaches of the C33 are designated as Give Way. Current engineering measures. In recent years, a number of engineering features have been installed to address the accident patterns at this junction. These include: A426 Southam Road • Provision of an interactive flashing junction warning sign. This sign was installed in 2006????. It is situated approx. 150m from the crossroads on the Southam side, and illuminates as traffic approaches the sign, to warn drivers of the crossroads and alert them of the need to adjust their speed. • Reduction in speed limit from 60mph to 50mph. This change in speed limit was introduced along the A426 In 2010???????, in response to concerns over the speed of traffic, and as a result of a number of injury accidents, along the route. • Yellow backed junction warning signs. • Red tarmac on approach to the crossroads and slow road markings C33 Napton Road (Stockton side) • Advanced give way signs • Yellow backed give way signs • 30mph speed limit extended to the crossroads C33 Stockton Road (Long Itchington side) • Yellow backed junction warning signs • Yellow backed give way signs and yellow backed advanced give way signs • 40mph speed limit from Long Itchington to the crossroads.

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Accident patterns There have been 10 recorded injury accidents in the time period selected. Manoeuvre Of these 10 accidents • three were recorded as failure to give way from Stockton Road, • four were recorded as failure to give way from Napton Road, • two were recorded as shunts on the main road as a result of a making a right turn manoeuvre in front, • the remaining was a miscellaneous incident.

car

Time of day Analysis of the accident details allows the time of day of each incident to be established. As this is a rural junction without street lighting, it is important to know if more accidents are occurring in darkness. Additionally, where traffic volumes are high on the main through route, it is necessary to establish if this influences the accident patterns. There is an equal split between accidents occurring at night in darkness, and those occurring in daylight hours. There is also an equal split in the numbers of accidents occurring at peak time, although all of those that did occur at peak time were recorded in the evening peak of between 16.00and 18.30pm.

Accidents by Year and Severity In order to assess the location in detail the following periods have been assessed. • • • • • •

2007 2008 2009 2010 2011 2012 – to end October

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Slight

Serious

Fatal

Total

2007

1

1

2008

1

1

2009

3

3

2010

2

2

2011

1

2012 to end October

1

1

2 1

Total

10

Accidents by Manoeuvre

Vehicle failing to give way from Stockton Road (Long Itchington side) Vehicle failing to give way from Napton Road (Stockton side) Right turn leading to shunt on main road Other

No

Site (%)

3

30

4

40

2

20

1

10

Accidents by Manoeuvre at time of day

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Am Peak (7.009.30) Vehicle failing to give way from Stockton Road (Long Itchington side)

Pm Peak (16.00 – 18.30) 1

Not peak times 2

3

1

1

1

Vehicle failing to give way from Napton Road (Stockton side) Right turn leading to shunt on main road Other

1

Accidents by Road Surface No

Site (%)

Dry

6

60%

Wet

4

40%

No

Site (%)

Fine

10

100%

Rain

0

0

Other

0

0

No

Site (%)

5

50%

5

50%

Accidents by Weather

Accidents by Light Conditions

Daylight Darkness – no street lighting 27 November 2012

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Accidents by Age of Driver/Riders No.

Site (%)

15 – 19

0

20 – 29

2

20%

30 – 59

6

60%

60 +

2

20%

Unknown

Age of Casualties Slight

Serious

Total

0 – 15 16 – 29

2

30 – 59

8

60 +

3

2 1

9 3

Unknown

Accidents by Day of Week

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No

Site (%)

Monday

2

20%

Tuesday

2

20%

Wednesday

2

20%

Thursday

1

10%

Friday

1

10%

Saturday

1

10%

Sunday

1

10%

3.0

County (whole) (%)

FINDINGS

There have been 10 recorded injury accidents at this junction in the time period considered in this report. Analysis of these accidents shows that:• • • • • • •

There is no predominant direction from which drivers are making incorrect decisions. Equal distribution of error from each side of the crossroads junction indicates issues from both of the minor road approaches to the junction The time of day when drivers are having the most crashes indicates a tendency to feel under pressure at peak times to complete the manoeuvre. There is no predominant day on which accidents are occurring, indicating no external factors are influencing the operation of this junction. Most drivers involved in these collisions are experienced drivers, so this is not thought to be an influencing factor. Analysis of the accident data does not indicate excessive speed on the main road as one of the predominant factors leading to these collisions. Only one accident studied in this report has resulted in serious injury to vehicle occupants

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CONCLUSIONS

Further work to determine where this road junction is ranked in ems of numbers of accidents, alongside other similar junctions in Warwickshire, to determine if it should be prioritised for inclusion in a programme of works. Further work needed to determine what improvements could be made to improve safety at the junction Further work to determine what type of improvement might be considered at this location. This should include the potential accident rate for any other type of junction arrangement considered. * *It should be noted that a roundabout will result in 1 - 2 accidents per annum. Traffic signals are not recommended in such a rural intersection, they too have an in-built accident rate of between 1 – 2 accidents per annum. The cost of providing a roundabout in this location is likely to be in excess of £1.5million.

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Stockton Crossroads report