Assessment of Level-Of-Service for Freeway Segments Using HCM and Microsimulation Methods

Jolovic, Dusan; Stevanovic, Aleksandar; Sajjadi, Soheil; Martin, Peter T.

doi:10.1016/j.trpro.2016.06.034

Cited by 13 publications

(9 citation statements)

References 6 publications

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“…Congestion measurement methods should be clearly comprehensible, applicable to statistical techniques, and replicable based on the results with a minimum amount of data collected during certain time periods (Rao and Rao, 2012). In this regard, level-of-service (LOS) is one of the most widely-used congestion measurement methods, specifically aimed at measuring traffic congestion and assessing the operational efficiency of existing road networks (Bhuyan and Nayak, 2013; Das and Pandit, 2016; Dowling et al., 2008; Ghods and Saccomanno, 2016; Jolovic et al., 2016; Ramadan and Sisiopiku, 2016; Rao and Rao, 2012).…”

Section: Level-of-service: a Congestion Measurement Methodsmentioning

confidence: 99%

“…The assessment of facility performance as described in the HCM is dependent on each different type of roadway segment (e.g. mainline, weave, merge, diverge) (Jolovic et al., 2016). The HCM procedures have constraints on achieving realistic and reliable data, which are a key factor for evaluating the operating status of roadway segments.…”

Section: Level-of-service: a Congestion Measurement Methodsmentioning

confidence: 99%

“…To overcome the limitation of HCM procedures on a LOS analysis, FREEVAL was developed in Microsoft Excel with Visual Basic Applications, which is a supplementary computational engine associated with the HCM. FREEVAL is a deterministic equation-based macroscopic and mesoscopic tool that provides segment-based densities to evaluate freeway facilities (Jolovic et al., 2016; Transportation Research Board, 2010). Jolovic and Stevanovic (2012) have pointed out that FREEVAL is incapable of capturing actual field data, such as speed and density under oversaturated freeway conditions.…”

Section: Point Of Departure: Knowledge Gapsmentioning

confidence: 99%

See 2 more Smart Citations

A land-use clustering approach to capturing the level-of-service of large urban corridors: A case study in downtown Los Angeles

Bae

Choi

2020

Environment and Planning B: Urban Analytics and City Science

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Level-of-service has been widely used to measure the operational efficiency of existing highway systems categorically, based on certain ranges of traffic speeds. However, this existing method is generic for investigating urban traffic characteristics. Hence, there is a crucial knowledge gap in capturing the unique traffic speed conditions during a certain temporal duration, in a common spatial area that includes different land use clusters. This study fills this gap by modeling the link between traffic speeds and land use clusters during certain time periods, along with the given level-of-service criteria. As a case study, this study adopted the central business district in Los Angeles in the United States. A total of 1780 traffic sensor speed data on Interstate 10 East adjacent to the central business district of Los Angeles was collected and clustered by the land use designated by the zoning regulations of the city of Los Angeles. The proposed traffic time–speed curve model that integrates different land uses in a large urban core was then developed and validated statistically, using historical real-world traffic data. Finally, an illustrative example was presented to demonstrate how the proposed model can be implemented to measure critical time periods and corresponding speeds per land-use cluster, responding to the designated level-of-service criteria. This study focused on making recommendations for government transportation agencies to employ an appropriate method that can estimate critical time periods affecting the existing operational status of a highway segment in different land-use clusters within a common spatial area, while promoting an effective application of a set of traffic sensor speed data.

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Section: Level-of-service: a Congestion Measurement Methodsmentioning

confidence: 99%

Section: Level-of-service: a Congestion Measurement Methodsmentioning

confidence: 99%

Section: Point Of Departure: Knowledge Gapsmentioning

confidence: 99%

See 1 more Smart Citation

A land-use clustering approach to capturing the level-of-service of large urban corridors: A case study in downtown Los Angeles

Bae

Choi

2020

Environment and Planning B: Urban Analytics and City Science

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“…Efficiency impacts the service level of travelers using the freeway [31]. In this study, efficiency was expressed as freeway travel cost, which is the sum of freeway travel time cost of all traffic demand.…”

Section: Freeway Travel Costmentioning

confidence: 99%

Optimization of Ramp Locations along Freeways: A Dynamic Programming Approach

Chen

et al. 2022

Sustainability

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Ramps provide entrances and exits for residents to conveniently use the freeway service. Due to the high construction cost and geometric design requirements, the decision of ramp locations involves a trade-off between multiple influencing factors, such as accessibility, safety, efficiency, construction costs, etc. This study proposed a methodology for optimizing freeway ramp placement in an effort to improve freeway accessibility. The freeway ramp locating problem was formulated as a bi-objective optimization model. Two objectives were pertinent to the reduction of total social costs: the minimization of total travel cost and minimization of total construction cost. To reflect the safety concern of ramp locations, the frequency of lane changes around the ramps and the minimum spacing between ramps were constrained. We developed an exact solution method based upon dynamic programming to solve the proposed model. Finally, a case study of the Beijing–Hong Kong–Macau Expressway within Henan Province, China, was conducted to verify the effectiveness of the proposed model and solution method.

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“…The Weibull model was used to estimate the capacity at the freeway bottleneck and obtained its longterm variation, and the results showed a long-term decreasing trend in traffic at the 5th percentile of the traffic collapse probability [17]. In addition, the diverging area serves as an intertwined roadway, and numerous studies have been conducted to estimate the level of service and the traffic capacity of the intertwined roadway [18]- [20].…”

mentioning

confidence: 99%

Study on the Rationality of Lane Imbalance Design in Freeway Diverging Areas

et al. 2024

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Currently, a lane imbalance design scheme without auxiliary lanes for two-lane exits is increasing. To study the rationality of this exit scheme, the relationship between lane balance and traffic efficiency in the diverging area is investigated using a drone and image recognition software. The Kalman filter is used to optimize the original data and simplify the process of extracting the traffic volume, density and speed by Frenet coordinate transformation. Under the three states of free flow, saturated flow and supersaturated flow, lane balanced exit and lane imbalanced exit simulation models were constructed by using VISSIM. Based on the traffic flow theory, the curve of the relationship between traffic volume and density was fitted. The traffic volume corresponding to the difference between two schemes at the same density not exceeding 5% or 10% is calculated, and this traffic volume is defined as the scheme selection limit value. The results show that the traffic efficiency of lane imbalance scheme is consistently lower than that of lane balance scheme under all traffic conditions at the freeway exits. However, the difference in traffic efficiency between the two schemes is not fixed but increases as the upstream input traffic volume increases. When the exit forecast service traffic volume is lower than the " scheme selection limit value " (SSLV), the difference in traffic efficiency between the two schemes will not exceed 5% or 10%. In conclusion, the lane imbalance scheme can be used in the diverging area under certain traffic volume conditions, thus reducing the land, engineering volume and cost requirements. It also provides ideas for the study of three-lane exit ramp design schemes.

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Assessment of Level-Of-Service for Freeway Segments Using HCM and Microsimulation Methods

Cited by 13 publications

References 6 publications

A land-use clustering approach to capturing the level-of-service of large urban corridors: A case study in downtown Los Angeles

A land-use clustering approach to capturing the level-of-service of large urban corridors: A case study in downtown Los Angeles

Optimization of Ramp Locations along Freeways: A Dynamic Programming Approach

Study on the Rationality of Lane Imbalance Design in Freeway Diverging Areas

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