Vulnerable User Road Safety Enhancements for Transportation Asset Management

Chang, Carlos M.; Vavrova, Marketa

doi:10.1061/9780784479926.022

Cited by 2 publications

(6 citation statements)

References 1 publication

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“…VRUSI was developed to identify high risk safety areas for pedestrians at intersections. The higher the VRUSI, the higher the risk for pedestrians [16]. Equation (1) The pedestrian level of comfort (PLOC) identifies safety needs for pedestrians on roadway segments based on roadway speed, number of lanes with sidewalks, bicycle lanes, parking, and planting buffers.…”

Section: Safety Indicesmentioning

confidence: 99%

“…Sidewalks, bikeways, medians, pavement markings, guardrails, and road lighting all have a significant influence on traffic safety [43]. The VRU-TAM framework considers all these asset components in the decision-making process.…”

Section: Vru-tam Framework Overviewmentioning

confidence: 99%

“…• PLOC 3-Suitable for older children, with little or no parental supervision. • PLOC 4-Mostly suitable for adults and children with parental supervision [16].…”

mentioning

confidence: 99%

“…PLTS 4-high traffic stress [16]. The pedestrian level of traffic stress (PLTS) rates pedestrian safety when crossing a roadway based on sidewalk condition, physical buffer type, total buffering width, general land use, collector and local un-signalized intersection crossing, and arterial un-signalized intersection crossing, with or without a median refuge.…”

mentioning

confidence: 99%

“…An able-bodied adult would feel uncomfortable, but safe using this facility. • PLTS 4-high traffic stress [16].…”

mentioning

confidence: 99%

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Integrating Vulnerable Road User Safety Criteria into Transportation Asset Management to Prioritize Budget Allocation at the Network Level

2022

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Safety is a major worldwide concern due to the increasing number of fatalities of vulnerable road users (VRUs). VRUs are pedestrians, bicyclists, and motorcyclists, and their safety is a priority when making infrastructure management decisions. Traditionally, transportation agencies have adopted transportation asset management (TAM) practices based on performance measures to assess the physical condition of transport infrastructure. This paper describes a framework to incorporate VRU’s safety into the TAM decision-making process. The main objective of the VRU-TAM framework is to mitigate pedestrian fatalities by improving the decision-making process at the strategic and operational management level. The VRU-TAM framework is composed of four phases: assessment, prioritization, scenario analysis, and results. It includes a prioritization methodology using a safety-weighted effectiveness ratio (SWER) to consider pedestrian safety factors and costs in the decision-making process. In a broader perspective, pedestrian safety is affected by driver, demographic, pedestrian, infrastructure, and policy related factors. The decision-making criteria reflected in SWER considers the asset importance, location, pedestrian safety risk, costs, and remaining life in the budget allocation process, and adopts the dynamic bubble up (DBU) technique for budget prioritization at the network level. An example is presented for crosswalks to demonstrate the applicability of the methodology to evaluate different budget-driven scenarios for funding allocation. As a conclusion, it is demonstrated that the outcomes of the budget-driven scenarios following the method that incorporates safety criteria, with tangible metrics, offer a deeper understanding of the effects of budgetary constraints on backlog costs and the remaining life of infrastructure assets.

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Section: Safety Indicesmentioning

confidence: 99%

Section: Vru-tam Framework Overviewmentioning

confidence: 99%

“…• PLOC 3-Suitable for older children, with little or no parental supervision. • PLOC 4-Mostly suitable for adults and children with parental supervision [16].…”

mentioning

confidence: 99%

mentioning

confidence: 99%

“…An able-bodied adult would feel uncomfortable, but safe using this facility. • PLTS 4-high traffic stress [16].…”

mentioning

confidence: 99%

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Integrating Vulnerable Road User Safety Criteria into Transportation Asset Management to Prioritize Budget Allocation at the Network Level

2022

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Comparison of the Performance of Hybrid Traffic Signal Patterns and Conventional Alternatives When Accounting for Both Pedestrians and Vehicles

2022

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Traffic control systems are crucial for managing traffic flows. Their main function is to reduce interactions among users for safety reasons, while minimizing the travel times. Researchers often concentrate on the cycle length, whose impact on travel times is directly measurable. However, the choice of the signal pattern may also have a great potential to reduce travel times and unsafe situations. This potential is yet to be thoroughly investigated. In this work, we are interested in comparing different signal patterns in terms of the number of potential conflicts and delay time for both drivers and pedestrians. To this end, we first select three commonly adopted signal patterns, namely the Exclusive Pedestrian Phase (EPP), the Leading Through Interval (LTI) and the Two-Way Crossing (TWC). We then generalize existing methods for measuring user delay and safety for these three signal patterns. Moreover, we investigate a hypothetical hybrid pattern obtained by dynamically adapting the signal pattern to real-time data. The proposed methodology is applied to a case study considering an isolated intersection in Montreal, Canada. We perform computational experiments geared towards determining the best pattern according to ad hoc performance indicators and user flows. Results show that the EPP and LTI patterns generally perform better than TWC. EPP generally outperforms LTI when measuring the number of potential conflicts, while LTI outperforms EPP when considering delay times. Furthermore, the hypothetical hybrid pattern shows a positive but overall limited impact regarding both delay times and number of potential conflicts.

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Vulnerable User Road Safety Enhancements for Transportation Asset Management

Cited by 2 publications

References 1 publication

Integrating Vulnerable Road User Safety Criteria into Transportation Asset Management to Prioritize Budget Allocation at the Network Level

Integrating Vulnerable Road User Safety Criteria into Transportation Asset Management to Prioritize Budget Allocation at the Network Level

Comparison of the Performance of Hybrid Traffic Signal Patterns and Conventional Alternatives When Accounting for Both Pedestrians and Vehicles

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