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A New Surrogate Safety Indicator for Microscopic Road Safety Evaluation.

Record Type:	Electronic resources : Monograph/item
Title/Author:	A New Surrogate Safety Indicator for Microscopic Road Safety Evaluation./
Author:	Mo, Zhou.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Notes:	Source: Dissertations Abstracts International, Volume: 83-05, Section: A.
Contained By:	Dissertations Abstracts International83-05A.
Subject:	Algorithms. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28832499
ISBN:	9798460440436

A New Surrogate Safety Indicator for Microscopic Road Safety Evaluation.
Mo, Zhou.

A New Surrogate Safety Indicator for Microscopic Road Safety Evaluation. - Ann Arbor : ProQuest Dissertations & Theses, 2021

Source: Dissertations Abstracts International, Volume: 83-05, Section: A.

Thesis (Ph.D.)--National University of Singapore (Singapore), 2021.

This item must not be sold to any third party vendors.

Traditional accident-based approach is not suitable for microscopic road safety evaluation due to small sample records. Instead, Traffic conflicts are often used as surrogate measures. Conventional application of traffic conflict indicators, e.g. time to collision (TTC), are often conducted at fixed time intervals, utilising the most critical moment of an encounter. Such approach cannot translate well into location-based evaluation, which is more meaningful for drivers and policy-makers. This research proposes space-based TTC (STTC), measured at fixed space intervals, capable of identifying risks microscopically at specific spots on the roadway. Thorough comparison with TTC suggests advantages of STTC in terms of formulation, aggregation perspective and interpretation for location-based safety evaluation. For threshold calibration, an optimization algorithm addressing different severity classes of conflicts and crashes is developed. Given the calibrated thresholds and weights, cross-correlation tests are conducted, which validates STTC and more importantly discovers a dislocation effect between conflict and crash locations.

ISBN: 9798460440436Subjects--Topical Terms:

536374
Algorithms.

A New Surrogate Safety Indicator for Microscopic Road Safety Evaluation.
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245 1 0 $a A New Surrogate Safety Indicator for Microscopic Road Safety Evaluation.
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500 $a Source: Dissertations Abstracts International, Volume: 83-05, Section: A.
502 $a Thesis (Ph.D.)--National University of Singapore (Singapore), 2021.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be sold to any third party vendors.
520 $a Traditional accident-based approach is not suitable for microscopic road safety evaluation due to small sample records. Instead, Traffic conflicts are often used as surrogate measures. Conventional application of traffic conflict indicators, e.g. time to collision (TTC), are often conducted at fixed time intervals, utilising the most critical moment of an encounter. Such approach cannot translate well into location-based evaluation, which is more meaningful for drivers and policy-makers. This research proposes space-based TTC (STTC), measured at fixed space intervals, capable of identifying risks microscopically at specific spots on the roadway. Thorough comparison with TTC suggests advantages of STTC in terms of formulation, aggregation perspective and interpretation for location-based safety evaluation. For threshold calibration, an optimization algorithm addressing different severity classes of conflicts and crashes is developed. Given the calibrated thresholds and weights, cross-correlation tests are conducted, which validates STTC and more importantly discovers a dislocation effect between conflict and crash locations.
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650 4 $a Automotive engineering. $3 2181195
650 4 $a Computer science. $3 523869
650 4 $a Engineering. $3 586835
650 4 $a Transportation. $3 555912
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710 2 $a National University of Singapore (Singapore). $3 3352228
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