Effect of passing zone length on operation and safety of two-lane rural highways in Uganda

Mwesige, Godfrey; Farah, Haneen; Bagampadde, Umaru; Koutsopoulos, Haris N.

doi:10.1016/j.iatssr.2016.09.001

Cited by 9 publications

(18 citation statements)

References 12 publications

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“…Similar results on isolated passing zones were obtained in Spain [10] and Uganda [11]. Experimental data from external observations showed that increasing the passing zone length over 1,100 m did not improve the passing rate much [10].…”

Section: Effects Of Passing Restrictions On Traffic Performancesupporting

confidence: 78%

“…The HCM analysis procedure accounts for the effect of passing restrictions through the percentage of no-passing zones. Consequently, two highways with the same length, but the first with one passing zone of 2,500 m and the second with ten passing zones of 250 m, will have the same results, which is quite unrealistic, as previous studies concluded that very short passing zones contribute little to traffic operations [4,10,11]. To overcome this shortcoming, we added one second parameter: average passing zone length.…”

Section: Research Statementmentioning

confidence: 99%

“…Passing behavior has been largely studied with different purposes. Most of the studies are centered on determining adequate passing sight distance criteria [3][4][5] and quantifying the number of passing maneuvers at isolated passing zones [6][7][8][9][10][11]. Rare are studies that explicitly link passing zone characteristics to traffic operations.…”

Section: Introductionmentioning

confidence: 99%

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Operational Considerations of Passing Zones for Two-lane Highways: Spanish Case Study

Moreno

Llorca

Washburn

et al. 2018

PROMET

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The U.S. Highway Capacity Manual (HCM 2010) methodology is used in Spain to evaluate traffic operation and quality of service. In two-lane undivided highways, the effect of limiting where drivers could pass slower vehicles, or passing restrictions, is considered through the percentage of no-passing zones. This measure does not account for how passing opportunities are distributed along the road. The objective of this research was to evaluate the effect percentage of no-passing zones and average passing zone length on a two-lane highway and, if significant, incorporate them in the analysis methodology,. The TWOPAS microsimulation program was calibrated and validated to the Spanish conditions. Passing restrictions had little effect on average traffic speed (ATS), with differences lower than 6 km/h between a road segment with no passing restrictions and a road segment with a passing restriction on 100% of its length. Conversely, passing restrictions can increase the percent time spent following (PTSF) up to 30%. Increasing the passing zone length beyond 2,000 m does not improve PTSF. The new models could be used to better estimate traffic operation on Spanish two-lane highways.

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Section: Effects Of Passing Restrictions On Traffic Performancesupporting

confidence: 78%

Section: Research Statementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Operational Considerations of Passing Zones for Two-lane Highways: Spanish Case Study

Moreno

Llorca

Washburn

et al. 2018

PROMET

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“…The traffic volume in the subject and opposing direction affect the passing rate (7,(10)(11)(12)(13)(14)(15)(16). It is expected that by increasing the traffic volume in the subject direction, the desire to pass should increase.…”

Section: Variablesmentioning

confidence: 99%

Explanatory Analysis of the Safety of Short Passing Zones on Two-Lane Rural Highways

Karimi

Boroujerdian

2020

Transportation Research Record: Journal of the Transportation R

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Passing zones afford sufficient passing distance for passing vehicles on two-lane rural highways. This study aimed to assess the effects of geometric and traffic variables on the safety of short passing zones using the rate of passing maneuvers ending in the no-passing zone as a surrogate safety measure. A Poisson regression model was applied to aerial data collected by drone at seven passing zones. The findings showed that increase in the length of the passing zone corresponds to decrease in the rate of passing maneuvers ending in the no-passing zone. The passing rate is also affected by the lane width, the percentage of heavy vehicles in the subject direction, and the directional split in the subject direction. The rate of passing maneuvers ending in no-passing zones reaches a peak as the two-way traffic flow rate increases to 600 vehicles per hour regardless of the directional split, or as the absolute vertical grade increases to 4.8%–6% depending on the percentage of heavy vehicles. After the peak value, the rate decreases. The presented model can serve as a tool for evaluating and improving the safety of short passing zones.

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“…For estimating PTSF, both HCM versions (Transportation Research Board, 2000, 2010 also do not provide guidance on the procedure for selecting the measurement location and duration of observation period (Romana and Pérez, 2006). A recent study also showed somFe significant effect of the length of passing zone on the passing rate (Mwesige et al, 2017).…”

Section: Introductionmentioning

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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Effect of passing zone length on operation and safety of two-lane rural highways in Uganda

Cited by 9 publications

References 12 publications

Operational Considerations of Passing Zones for Two-lane Highways: Spanish Case Study

Operational Considerations of Passing Zones for Two-lane Highways: Spanish Case Study

Explanatory Analysis of the Safety of Short Passing Zones on Two-Lane Rural Highways

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

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