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Transportation Letters
The International Journal of Transportation Research
Volume 14, 2022 - Issue 4
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Research Article

Introducing novel statistical-based method of screening and combining currently well-known surrogate safety measures

ORCID Icon, ORCID Icon &
Pages 385-395 | Published online: 15 Jan 2021
 

ABSTRACT

Until now various surrogate safety measures (SSM) have been developed and research in this area is ongoing. However, it is unclear which indicators are able to reflect danger more accurately. This paper proposes a novel method of performance comparison by taking the advantage of statistical analyses of SSMs data. This analytical approach is inspired by the dominant behavior of drivers in car-following scenarios. Afterward, those indicators that previously identified as eligible are merged using a recently developed safety indicator, named collision probability (CP). The proposed method is applied to microscopic traffic data collected from the I-80 freeway in Next Generation Simulation (NGSIM) project. The results indicated that the proposed framework helps screen SSMs and calculate the probability of rear-end collisions using a combination of the selected SSMs. The results might be helpful for improving the precision and accuracy of in-vehicle collision avoidance warning system and safety evaluations without crash data.

Nomenclature

Xi=

Position of the vehicle i in horizontal direction

Vi=

Speed of the vehicle i in horizontal direction

li=

Length of the vehicle i

t=

Time instant

T=

Duration of car-following

μ=

Friction factor

Δt=

Reaction time

g=

Acceleration due to gravity

MADR=

Maximum deceleration rate to avoid collision

L=

The leading vehicle

F=

The following vehicle

TTC=

Time-to-Collision

TTC*=

Critical threshold for TTC

MTTC=

Modified TTC

GTTC=

General TTC

TET=

Time-Exposed TTC

TIT=

Time-Integrated TTC

CMT=

Comprehensive measure based on TTC

TTCD=

TTC with disturbance

GT=

Gap Time

DRAC=

Deceleration Rate to Avoid Collision

PSD=

Proportion of Stopping Distance

RECP=

Rear-End Collision Probability

DSS=

Difference between space distance and stopping distance

Availability of data

The data that support the findings of this study are available in http://ngsim.fhwa.dot.gov.

Disclosure statement

No potential conflict of interest was reported by the authors.

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