QuickZone Improvement for Rural Freeway and Model Validation
This review indicated that in QuickZone 2.0 a deterministic queuing model is applied to calculate the delays for oversaturated conditions; stochastic and speed reduction delays were not included. Data collected from rural freeways in Mississippi show that saturated and oversaturated traffic flow may...
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Published in | Transportation research record Vol. 2107; no. 1; pp. 34 - 45 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Los Angeles, CA
SAGE Publications
2009
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Abstract | This review indicated that in QuickZone 2.0 a deterministic queuing model is applied to calculate the delays for oversaturated conditions; stochastic and speed reduction delays were not included. Data collected from rural freeways in Mississippi show that saturated and oversaturated traffic flow may not occur in work zones. For situations like this, the delay components that are not included in QuickZone are significant. The current delay model of QuickZone needs improvement. This paper describes a model improvement made to QuickZone. The improvement considers delays from the deceleration before a work zone, slow-moving traffic along the work zone, acceleration after the work zone, and stochastic delays within the work zone area. The Excel Visual Basic Application implementation of the model in QuickZone is discussed in this paper. Traffic flow parameters such as speed and volume of more than 10 work zones in the rural area of Mississippi were collected to verify the newly improved QuickZone in undersaturated conditions; CORSIM, traffic simulation software sponsored by FHWA, was utilized to compare the delay from the improved QuickZone for the work zones in oversaturated conditions. Verification results from the numerical examples showed that the improved QuickZone provided more reasonable delay estimations than the original version did, especially for rural work zones in under-saturated conditions. Therefore, the improved QuickZone can capture the delays in undersaturated and oversaturated conditions. |
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AbstractList | This review indicated that in QuickZone 2.0 a deterministic queuing model is applied to calculate the delays for oversaturated conditions; stochastic and speed reduction delays were not included. Data collected from rural freeways in Mississippi show that saturated and oversaturated traffic flow may not occur in work zones. For situations like this, the delay components that are not included in QuickZone are significant. The current delay model of QuickZone needs improvement. This paper describes a model improvement made to QuickZone. The improvement considers delays from the deceleration before a work zone, slow-moving traffic along the work zone, acceleration after the work zone, and stochastic delays within the work zone area. The Excel Visual Basic Application implementation of the model in QuickZone is discussed in this paper. Traffic flow parameters such as speed and volume of more than 10 work zones in the rural area of Mississippi were collected to verify the newly improved QuickZone in undersaturated conditions; CORSIM, traffic simulation software sponsored by FHWA, was utilized to compare the delay from the improved QuickZone for the work zones in oversaturated conditions. Verification results from the numerical examples showed that the improved QuickZone provided more reasonable delay estimations than the original version did, especially for rural work zones in under-saturated conditions. Therefore, the improved QuickZone can capture the delays in undersaturated and oversaturated conditions. This review indicated that in QuickZone 2.0 a deterministic queuing model is applied to calculate the delays for oversaturated conditions; stochastic and speed reduction delays were not included. Data collected from rural freeways in Mississippi show that saturated and oversaturated traffic flow may not occur in work zones. For situations like this, the delay components that are not included in QuickZone are significant. The current delay model of QuickZone needs improvement. This paper describes a model improvement made to QuickZone. The improvement considers delays from the deceleration before a work zone, slow-moving traffic along the work zone, acceleration after the work zone, and stochastic delays within the work zone area. The Excel Visual Basic Application implementation of the model in QuickZone is discussed in this paper. Traffic flow parameters such as speed and volume of more than 10 work zones in the rural area of Mississippi were collected to verify the newly improved QuickZone in undersaturated conditions; CORSIM, traffic simulation software sponsored by FHWA, was utilized to compare the delay from the improved QuickZone for the work zones in oversaturated conditions. Verification results from the numerical examples showed that the improved QuickZone provided more reasonable delay estimations than the original version did, especially for rural work zones in undersaturated conditions. Therefore, the improved QuickZone can capture the delays in undersaturated and oversaturated conditions. |
Author | Gou, Jizhan Altman, Jeffrey C. Davis, Will Zhang, Li |
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References | Jiang 2001; 40 Keenan 2004; 68 bibr6-2107-04 Jiang Y. (bibr10-2107-04) 2001; 40 Benekohal R. (bibr9-2107-04) 1994 MitreTek Systems. (bibr11-2107-04) 2001 FHWA, U.S. Department of Transportation. (bibr2-2107-04) MitreTek Systems. (bibr12-2107-04) 2005 Keenan C. (bibr5-2107-04) 2004; 68 bibr8-2107-04 bibr3-2107-04 Chitturi M. (bibr4-2107-04) FHWA, U.S. Department of Transportation. (bibr7-2107-04) bibr1-2107-04 |
References_xml | – publication-title: Work Zone Safety and Mobility (final rule). – volume: 68 issue: 3 year: 2004 article-title: Work Zones That Work. publication-title: Public Roads contributor: fullname: Keenan – volume: 40 start-page: 65 issue: 4 year: 2001 end-page: 81 article-title: Estimation of Traffic Delays and Vehicle Queues at Freeway Work Zones. publication-title: Journal of the Transportation Research Forum contributor: fullname: Jiang – publication-title: Work Zone & Traffic Analysis/Management. – ident: bibr3-2107-04 – ident: bibr7-2107-04 publication-title: Work Zone & Traffic Analysis/Management. contributor: fullname: FHWA, U.S. Department of Transportation. – volume: 40 start-page: 65 issue: 4 year: 2001 ident: bibr10-2107-04 publication-title: Journal of the Transportation Research Forum contributor: fullname: Jiang Y. – ident: bibr2-2107-04 publication-title: Work Zone Safety and Mobility (final rule). contributor: fullname: FHWA, U.S. Department of Transportation. – volume-title: Comparison of Queue Length Estimates from QUEWZ, FRESIM, and QuickZone with Field Data. ident: bibr4-2107-04 contributor: fullname: Chitturi M. – ident: bibr8-2107-04 – ident: bibr6-2107-04 – ident: bibr1-2107-04 – volume: 68 issue: 3 year: 2004 ident: bibr5-2107-04 publication-title: Public Roads contributor: fullname: Keenan C. – volume-title: QuickZone Delay Estimation Program Version 0.99, User Guide. year: 2001 ident: bibr11-2107-04 contributor: fullname: MitreTek Systems. – start-page: 41 volume-title: Transportation Research Record 1442 year: 1994 ident: bibr9-2107-04 contributor: fullname: Benekohal R. – volume-title: QuickZone Delay Estimation Program Version 2.0, User Guide. year: 2005 ident: bibr12-2107-04 contributor: fullname: MitreTek Systems. |
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Snippet | This review indicated that in QuickZone 2.0 a deterministic queuing model is applied to calculate the delays for oversaturated conditions; stochastic and speed... |
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Title | QuickZone Improvement for Rural Freeway and Model Validation |
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