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Event-based road safety assessment : A novel approach towards risk microsimulation in roundabouts

Bulla-Cruz, Lenin Alexander LU ; Laureshyn, Aliaksei LU orcid and Lyons, Liliana (2020) In Measurement: Journal of the International Measurement Confederation 165.
Abstract

Conventional road accident risk is measured by the undesirable events/exposure ratio. Common exposure indicators are activity-based, so event-based exposure is needed to achieve event-based safety assessment. Furthermore, road safety simulation is a growing research field. The influence of some software parameters is still unknown. Besides, the use of simulation for exposure assessment is incipient. This paper aims to validate a preventive event-based risk indicator: traffic conflicts/encounters, extending to risk microsimulation by a novel procedure to identify encounters in VISSIM. We evaluated the safety of a roundabout by three independent methods: [i] Swedish Traffic Conflict Technique using T-Analyst tool, [ii] VISSIM/SSAM... (More)

Conventional road accident risk is measured by the undesirable events/exposure ratio. Common exposure indicators are activity-based, so event-based exposure is needed to achieve event-based safety assessment. Furthermore, road safety simulation is a growing research field. The influence of some software parameters is still unknown. Besides, the use of simulation for exposure assessment is incipient. This paper aims to validate a preventive event-based risk indicator: traffic conflicts/encounters, extending to risk microsimulation by a novel procedure to identify encounters in VISSIM. We evaluated the safety of a roundabout by three independent methods: [i] Swedish Traffic Conflict Technique using T-Analyst tool, [ii] VISSIM/SSAM conflict analysis, and, [iii] exposure mapping using encounters. Findings show that, once calibrated the safety distance factor of VISSIM conflict areas at 0.5, we got a similar number of observed and simulated conflicts, similar severities and similar number of encounters, resulting in similar observed and simulated risk outcomes.

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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Exposure, Risk, SSAM, Surrogate safety measures, Traffic conflicts, Traffic encounters, VISSIM
in
Measurement: Journal of the International Measurement Confederation
volume
165
article number
108192
publisher
Elsevier
external identifiers
  • scopus:85088030792
ISSN
0263-2241
DOI
10.1016/j.measurement.2020.108192
language
English
LU publication?
yes
id
6e7a687e-28da-42e4-95dc-673b56062ad0
date added to LUP
2020-07-27 12:34:50
date last changed
2022-04-18 23:41:38
@article{6e7a687e-28da-42e4-95dc-673b56062ad0,
  abstract     = {{<p>Conventional road accident risk is measured by the undesirable events/exposure ratio. Common exposure indicators are activity-based, so event-based exposure is needed to achieve event-based safety assessment. Furthermore, road safety simulation is a growing research field. The influence of some software parameters is still unknown. Besides, the use of simulation for exposure assessment is incipient. This paper aims to validate a preventive event-based risk indicator: traffic conflicts/encounters, extending to risk microsimulation by a novel procedure to identify encounters in VISSIM. We evaluated the safety of a roundabout by three independent methods: [i] Swedish Traffic Conflict Technique using T-Analyst tool, [ii] VISSIM/SSAM conflict analysis, and, [iii] exposure mapping using encounters. Findings show that, once calibrated the safety distance factor of VISSIM conflict areas at 0.5, we got a similar number of observed and simulated conflicts, similar severities and similar number of encounters, resulting in similar observed and simulated risk outcomes.</p>}},
  author       = {{Bulla-Cruz, Lenin Alexander and Laureshyn, Aliaksei and Lyons, Liliana}},
  issn         = {{0263-2241}},
  keywords     = {{Exposure; Risk; SSAM; Surrogate safety measures; Traffic conflicts; Traffic encounters; VISSIM}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Measurement: Journal of the International Measurement Confederation}},
  title        = {{Event-based road safety assessment : A novel approach towards risk microsimulation in roundabouts}},
  url          = {{http://dx.doi.org/10.1016/j.measurement.2020.108192}},
  doi          = {{10.1016/j.measurement.2020.108192}},
  volume       = {{165}},
  year         = {{2020}},
}