Verification of statements re Lambeth Bridge north and south
Request ID: FOI-3107-2324 Date published: 22 December 2023
You asked
An email from Abbas Raza dated 17 November 2023 included the following statements:
1) Lambeth Bridge north and south is in the top 50-75 percentile for road danger London-wide.
2) Lambeth Bridge southern junction is the 52nd most dangerous junction in London.
Please supply the tabulation(s) or other analysis/es of “London-wide” and/or “in London” data respectively upon which these statements are based.
Notes:
1. For your convenience, the email is reproduced below
2. This request relates to the respective tabulations or analyses, not the raw data upon which they are based
3. This request – though similar in nature and relating to broadly comparable issues – is separate from CRM:01405.
We answered
Our Ref: FOI-3107-2324 Thank you for your request received on 29 November 2023 asking for information about road safety. Your request has been considered in accordance with the requirements of the Environmental Information Regulations (EIR) and our information access policy. I can confirm that we do hold the information you require. You asked for:
Verification of statements re Lambeth Bridge north and south CRM:0139642 1) Lambeth Bridge north and south is in the top 50-75 percentile for road danger London-wide. 2) Lambeth Bridge southern junction is the 52nd most dangerous junction in London.
Please supply the tabulation(s) or other analysis/es of “London-wide” and/or “in London” data respectively upon which these statements are based. 1) Lambeth Bridge north and south is in the top 50-75 percentile for road danger London-wide
The approach to identifying road safety priorities considers historic casualty harm, expected harm and actual harm by mode to identify locations with excess harm. This enables us to identify where intervention should have the biggest impact by reducing risk the most and helps to focus attention on where we can potentially achieve the greatest reductions in collisions. Casualty harm is a weighting applied to casualties based on their severity rather than a straight count of collisions. Excess harm is defined as the additional harm observed per road segment compared to expected harm.
Casualty quantiles show the range in which the harm rate or excess harm sits for each road segment. The casualty harm data covers the period between 1 January 2016 to 3 April 2020. The data should be used alongside TfL’s Road Danger Reduction Dashboard (see here), local intelligence and other data, such as complaints and police reports. We also encourage collision statistics (Collstats) to be used.
The tabulation for Road Safety Priorities is attached. Row 509 is the Lambeth Bridge north and south location.
The quantiles, emphasising the most harmful roads, were generated from the ‘casualty_1’ values as follows:
Values
Legend
0.000000 – 0.845064
0% - 25%
0.845064 - 1.487405
25% - 50%
1.487405 - 2.453080
50% - 75%
2.453080 - 4.275700
75% - 95%
4.275700 – 5.546810
95% - 98%
5.546810 – 10.000000
98% - 100%
This confirms that Lambeth Bridge is ranked in the top 50-75 percentile for road danger London-wide.
2) Lambeth Bridge southern junction is the 52nd most dangerous junction in London
Looking at 4,821 junctions in London that are recorded as junctions in the Collstats database, this junction (Lambeth Bridge southern junction) had 15 collisions. Of these, eight involved a pedal cyclist injury (all severities) for 36 months up to the end of September 2021. If the Collstats nodes are ranked by pedal cycle collisions (all severities), this junction sits at joint 8th in the list (along with 19 other junctions). Please see the attachment nodes ranked by pedal cycle collisions 36 months to September 2021. This data and ranking changes regularly, depending on the number of collisions that occur during a particular period. However this data is taken from a point in time, i.e. 36 months to the end of September 2021.
If this is not the information you are looking for, or if you are unable to access it for any reason, please do not hesitate to contact me.
Please see the attached information sheet for details of your right to appeal. Yours sincerely Gemma Jacob Senior FOI Case Officer FOI Case Management Team General Counsel Transport for London [email protected]
