Field Evaluation of <i>Highway Capacity Manual</i> 2000 Analysis Procedures for Two-Lane Highways

Dixon, Michael P; Sarepali, Satya Sai Kumar; Young, K.

doi:10.3141/1802-15

Cited by 29 publications

(32 citation statements)

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“…Many studies have been focused on PTSF and platooning (4 -9), and they even developed 19 new methodologies for estimating performance on two-lane highways based on the average number of 20 headways inside and between platoons (10) and using speed and headways (5, 11). The 3-second 21 headway rule was used to estimate the percentage following in most operational studies (4,5,6,8,12,22 13), as set on the HCM (3). However, other authors proposed 4 or 5 seconds (7,10,14,15,16).…”

Section: Alfredo Garcíamentioning

confidence: 99%

“…On the other hand, an optimum traffic volume that 6 maximizes passing rate was not found because even though the number of passes was higher with 7 traffic volumes between 600 and 700 veh/h, the following vehicles were also higher. Consequently, 8 the percentage of following vehicles that passed always decreases with traffic volume. 9 Figure 4 could be used twofold.…”

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confidence: 95%

“…Besides, the model predicted that the maximum percentage of drivers that follow a vehicle 5 and could perform a passing maneuver was 52 %; with two-way traffic volume of 200 veh/h and 6 passing zone length of 1,200 m. The model could be used to determine the minimum passing zone 7 length or maximum traffic volume that provides a determinate passing rate. 8 The passing frequency and passing rate models were validated with data from other twelve 9 additional passing zones. The additional scenarios presented different traffic volumes and lengths.…”

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confidence: 99%

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Operational Effectiveness of Passing Zones Depending on Length and Traffic Volume

Moreno

Llorca

García

et al. 2013

Transportation Research Record

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Most studies on two-lane highway operations have focused on the percentage of following vehicles or the adjustment of the Highway Capacity Manual (HCM) procedure to local data. The HCM proposes the length of no-passing zones as a model parameter; however, the distribution and characteristics of passing zones are not addressed. In fact, only a few studies on the expected number of passes in a passing zone have been carried out. This research presents an analysis of the effectiveness of passing zones in terms of their length and traffic volume. Data were collected from four passing zones on a rural highway in Spain. The two-way traffic volumes ranged from 100 to 900 vehicles per hour (vph), and the passing zone lengths ranged from 265 to 1,270 m. More than 1,600 passing maneuvers were recorded. The operational effectiveness of the passing zones was obtained from the passing frequency and the passing rate. The results indicated that the longer the passing zone, the higher the passing frequency; however, the results stabilized with lengths above 1,100 m. Balanced flows with two-way traffic volumes between 600 and 700 vph optimized the number of passes. Nevertheless, the increase in the passing frequency with the traffic volume was lower than with the increase in following vehicles. The results were validated with data from another 12 passing zones. Finally, HCM adjustments based on the percentage of no-passing zones did not reliably represent the effectiveness of passing zones. Therefore, the effectiveness of every passing zone should be considered, and adjustment factors should be modified to maximize the passing opportunities for traffic volumes between 600 and 700 vph.

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Section: Alfredo Garcíamentioning

confidence: 99%

mentioning

confidence: 95%

mentioning

confidence: 99%

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Operational Effectiveness of Passing Zones Depending on Length and Traffic Volume

Moreno

Llorca

García

et al. 2013

Transportation Research Record

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“…The HCM procedures for estimating PTSF have drawn a significant number of disagreements among researchers. Several researchers noted that the procedures produce inconsistent results with the surrogate 3-s criterion and overestimate PTSF and in some cases, the range of the average difference was 20-40% (Luttinen, 2001;Dixon et al, 2002;Harwood et al, 2003;Al-Kaisy and Durbin, 2007;Cohen and Polus, 2011). The plausible reason for this could be site-specific driver behavior that varies from one place to another.…”

Section: Review Of Existing Methodsmentioning

confidence: 99%

Development of Direct Models for Percent Time-Spent Following on Two-Lane Highways

Ahmed

Easa

2020

Front. Built Environ.

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The percent time-spent following (PTSF) is a key measure for estimating the level-of-service for two-lane highways. However, PTSF is currently estimated indirectly using various measured field data. This study proposes two alternative direct models for estimating PTSF: (1) a general linear regression model using typically-used input variables and (2) a non-linear form using only the follower density. Both models are based on data generated from the corridor micro-simulation (CORSIM) software. Comparison of the proposed models with the new directional PTSF analytical model of the Highway Capacity Manual shows that the proposed models are capable of predicting simulationgenerated PTSF quite closely with absolute mean error <3% using two different sets of validation datasets. The results of this research would be useful for a convenient and direct estimation of directional PTSF of two-lane highways.

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“…Ako je vrijeme slijeda manje od 3 sekunde, vozila su u koloni, a u suprotnom nisu u koloni. Proračun prema HCM 2010 izvodi se prema izrazu -prometni tok suprotnog smjera (OV/h) Istraživanja u svijetu pokazala su značajna odstupanja na terenu u odnosu na proraču-ne prema ovoj metodologiji [2][3][4][5][6][7][8][9][10][11][12][13], a rezultat su drukčijih uvjeta toka pojedinih područja kao i nedostataka samog modela. Posljednjih desetljeća u regiji nisu provedena istraživanja na ovu temu i HCM se u praksi rabi u izvornom obliku.…”

Section: Uvodunclassified

Level of service on two-way rural roads

Čutura¹

2017

Zajednički Temelji 2017 - Peti Skup Mladih Istraživača Iz Područja Građevinarstva I Srodnih Tehničkih Znanosti - Zbornik Radova

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SažetakRazina usluge (eng. Level of Service -LOS) dvotračnih izvangradskih cesta u BiH i susjednim državama računa se prema HCM 2010 (Highway Capacity Manual 2010) metodologiji. Definira se na osnovi mjera efikasnosti prosječne brzine putovanja (eng. Average Travel Speed -ATS) i postotka vremena provedenog u koloni (eng. Percent Time Spent Following -PTSF). Parametar PTSF je definiran kao postotak vremena koje vozilo provede u koloni vozeći se iza sporijeg vozila. Taj parametar određuje slobodu manevriranja i udobnost vožnje i povezan je sa sigurnosti prometa jer vožnja u koloni izaziva nervozu kod vozača i opasno ponašanje (nedopuštena pretjecanja, itd.). Zato je postotak vremena provedenog u koloni PTSF najvažnija mjera u smislu opisa kvalitete odvijanja prometa. HCM je definirao vrijeme slijeda (headway) tri sekunde između vozila, kao mjeru za određivanje na terenu. Mnoga istraživanja su pokazala značajna odstupanja na terenu u odnosu na proračune prema HCM metodologiji, a rezultat su drukčijih uvjeta toka pojedinih područja kao i nedostataka samog modela. U radu su prezentirana dosadašnja istraživanja i ciljevi za definiranje modela proračuna PTSF-a (razine usluge). Ključne riječi: razina usluge, postotak vremena provedenog u koloni Level of service on two-way rural roads AbstractThe level of service (LOS) on two-way rural roads in Bosnia and Herzegovina and neighbouring countries is calculated according to HCM 2010 (Highway Capacity Manual, 2010) methodology. It is defined by measuring efficiency of the average travel speed (ATS) and the percent time spent following in platoon (PTSF). The PTSF parameter is defined as the percentage of time that vehicle drives behind a slower vehicle in platoon. This parameter defines the freedom of manoeuvring and driving comfort, and is related to traffic safety because driving in platoon causes driver nervousness and dangerous behaviour (prohibited overtaking, etc.). That is why the PTSF is the most important measure for the quality of traffic flow. The HCM defines three second headway between the vehicles as a field measure. Many studies have shown significant field deviations compared to calculations according to HCM methodology, as a result of different traffic flow conditions in certain areas, and due to imperfections of the model itself. The paper presents the research conducted so far and goals for defining the model for the calculation of PTSF (level of service).

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Field Evaluation of Highway Capacity Manual 2000 Analysis Procedures for Two-Lane Highways

Cited by 29 publications

References 1 publication

Operational Effectiveness of Passing Zones Depending on Length and Traffic Volume

Operational Effectiveness of Passing Zones Depending on Length and Traffic Volume

Development of Direct Models for Percent Time-Spent Following on Two-Lane Highways

Level of service on two-way rural roads

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