Speed Variation Analysis

Research shows that vehicle speed affects the severity of all road crashes. Higher speed crashes involve more kinetic energy: the more energy that is dispersed in a crash, the more severe that crash will be. Speed also affects the likelihood of a crash occurring in the first place. The likelihood of a serious or fatal crash increases significantly even with small increases in vehicle speed. Field studies demonstrate that a one percent increase in mean average speeds results in a roughly two percent increase in the frequency of crashes involving injury, a three percent increase in severe crashes, and a four percent increase in deaths. The safety of infrastructure is heavily influenced by traffic speed, to the extent that without a detailed understanding of speed limits and vehicle operating speeds, it is difficult to assess the safety performance of infrastructure at a given location. This report seeks to highlight the central role of speed management in the Safe System approach and how a simple speed variation can improve safety for all types of road user. At the core of this report lies the experience derived from iRAP assessments undertaken under the Bloomberg Philanthropies Initiative for Global Road Safety (BIGRS) on 867 km of national roads in Thailand and 258 km of streets in Bangkok, between 2015 and 2019. This also involved capacity building activities with local partner, Chulalongkorn University, which led to almost 700 specialists being trained on road safety engineering during this period. The importance of speed in influencing road user risk is highlighted in two case studies on different road types in Thailand — the Outer Ring Road and Hathai Rat Road in Bangkok — to demonstrate the effects of different speeds on the iRAP Star Ratings. These ratings objectively quantify the likelihood of a crash, and its severity, whereby a person's risk of injury is highest on a 1-star road, and lowest on a 5-star road. Among a series of simulations and results, this report shows that enforcing a 10 kph speed limit reduction could prevent one in three fatal and serious injuries (FSIs) on both those roads.

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Bibliographic Details
Main Author: World Bank
Format: Report biblioteca
Language:English
Published: World Bank, Washington, DC 2019-07-01
Subjects:ROAD SAFETY, SPEED LIMITS, ROAD TRAFFIC INJURIES, SPEED VARIATION,
Online Access:http://documents.worldbank.org/curated/en/641651575999780678/Speed-Variation-Analysis-A-Case-Study-for-Thailands-Roads
https://hdl.handle.net/10986/33097
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spelling dig-okr-10986330972024-08-07T18:59:31Z Speed Variation Analysis A Case Study for Thailand's Roads World Bank ROAD SAFETY SPEED LIMITS ROAD TRAFFIC INJURIES SPEED VARIATION Research shows that vehicle speed affects the severity of all road crashes. Higher speed crashes involve more kinetic energy: the more energy that is dispersed in a crash, the more severe that crash will be. Speed also affects the likelihood of a crash occurring in the first place. The likelihood of a serious or fatal crash increases significantly even with small increases in vehicle speed. Field studies demonstrate that a one percent increase in mean average speeds results in a roughly two percent increase in the frequency of crashes involving injury, a three percent increase in severe crashes, and a four percent increase in deaths. The safety of infrastructure is heavily influenced by traffic speed, to the extent that without a detailed understanding of speed limits and vehicle operating speeds, it is difficult to assess the safety performance of infrastructure at a given location. This report seeks to highlight the central role of speed management in the Safe System approach and how a simple speed variation can improve safety for all types of road user. At the core of this report lies the experience derived from iRAP assessments undertaken under the Bloomberg Philanthropies Initiative for Global Road Safety (BIGRS) on 867 km of national roads in Thailand and 258 km of streets in Bangkok, between 2015 and 2019. This also involved capacity building activities with local partner, Chulalongkorn University, which led to almost 700 specialists being trained on road safety engineering during this period. The importance of speed in influencing road user risk is highlighted in two case studies on different road types in Thailand — the Outer Ring Road and Hathai Rat Road in Bangkok — to demonstrate the effects of different speeds on the iRAP Star Ratings. These ratings objectively quantify the likelihood of a crash, and its severity, whereby a person's risk of injury is highest on a 1-star road, and lowest on a 5-star road. Among a series of simulations and results, this report shows that enforcing a 10 kph speed limit reduction could prevent one in three fatal and serious injuries (FSIs) on both those roads. 2019-12-24T16:13:53Z 2019-12-24T16:13:53Z 2019-07-01 Report Rapport Informe http://documents.worldbank.org/curated/en/641651575999780678/Speed-Variation-Analysis-A-Case-Study-for-Thailands-Roads https://hdl.handle.net/10986/33097 English CC BY 3.0 IGO http://creativecommons.org/licenses/by/3.0/igo World Bank application/pdf text/plain World Bank, Washington, DC
institution Banco Mundial
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country Estados Unidos
countrycode US
component Bibliográfico
access En linea
databasecode dig-okr
tag biblioteca
region America del Norte
libraryname Biblioteca del Banco Mundial
language English
topic ROAD SAFETY
SPEED LIMITS
ROAD TRAFFIC INJURIES
SPEED VARIATION
ROAD SAFETY
SPEED LIMITS
ROAD TRAFFIC INJURIES
SPEED VARIATION
spellingShingle ROAD SAFETY
SPEED LIMITS
ROAD TRAFFIC INJURIES
SPEED VARIATION
ROAD SAFETY
SPEED LIMITS
ROAD TRAFFIC INJURIES
SPEED VARIATION
World Bank
Speed Variation Analysis
description Research shows that vehicle speed affects the severity of all road crashes. Higher speed crashes involve more kinetic energy: the more energy that is dispersed in a crash, the more severe that crash will be. Speed also affects the likelihood of a crash occurring in the first place. The likelihood of a serious or fatal crash increases significantly even with small increases in vehicle speed. Field studies demonstrate that a one percent increase in mean average speeds results in a roughly two percent increase in the frequency of crashes involving injury, a three percent increase in severe crashes, and a four percent increase in deaths. The safety of infrastructure is heavily influenced by traffic speed, to the extent that without a detailed understanding of speed limits and vehicle operating speeds, it is difficult to assess the safety performance of infrastructure at a given location. This report seeks to highlight the central role of speed management in the Safe System approach and how a simple speed variation can improve safety for all types of road user. At the core of this report lies the experience derived from iRAP assessments undertaken under the Bloomberg Philanthropies Initiative for Global Road Safety (BIGRS) on 867 km of national roads in Thailand and 258 km of streets in Bangkok, between 2015 and 2019. This also involved capacity building activities with local partner, Chulalongkorn University, which led to almost 700 specialists being trained on road safety engineering during this period. The importance of speed in influencing road user risk is highlighted in two case studies on different road types in Thailand — the Outer Ring Road and Hathai Rat Road in Bangkok — to demonstrate the effects of different speeds on the iRAP Star Ratings. These ratings objectively quantify the likelihood of a crash, and its severity, whereby a person's risk of injury is highest on a 1-star road, and lowest on a 5-star road. Among a series of simulations and results, this report shows that enforcing a 10 kph speed limit reduction could prevent one in three fatal and serious injuries (FSIs) on both those roads.
format Report
topic_facet ROAD SAFETY
SPEED LIMITS
ROAD TRAFFIC INJURIES
SPEED VARIATION
author World Bank
author_facet World Bank
author_sort World Bank
title Speed Variation Analysis
title_short Speed Variation Analysis
title_full Speed Variation Analysis
title_fullStr Speed Variation Analysis
title_full_unstemmed Speed Variation Analysis
title_sort speed variation analysis
publisher World Bank, Washington, DC
publishDate 2019-07-01
url http://documents.worldbank.org/curated/en/641651575999780678/Speed-Variation-Analysis-A-Case-Study-for-Thailands-Roads
https://hdl.handle.net/10986/33097
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