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Author: Conrad Louis Dudek
Publisher:
ISBN:
Category :
Languages : en
Pages : 420
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Book Description
This dissertation was concerned with a study of operational controls on urban freeways. An analysis was made of the inbound Gulf Freeway to define the operational problems resulting from vehicular incidents. It was found that significant congestion, delay, and stoppage waves frequently occur on the inbound Gulf Freeway because of the reduction in capacity caused by incidents on the main-lanes. Approximately 80 percent of the incidents reduce the inbound freeway capacity by one-half or more; about 13 incidents per week occur in the study section Monday through Friday from 6 a.m. to 7 p.m. A design concept of a prototype was formulated to increase freeway efficiency by alerting motorists to stoppage waves on freeway sections such as overpasses having restricted sight distances. The prototype was referred to as a safety warning system. It is anticipated that the improved efficiency will result in fewer accidents; reduced system travel time, driver anxiety, and driver discomfort; and improvement in the level of service. Several design alternatives were evaluated. A control technique utilizing critical energy as a parameter was developed and its application to digital computer control of the prototype was investigated. Evaluations were made of the performance, reliability, stability, and sensitivity of the system using a one-lane criterion for control. ...
Author: Conrad Louis Dudek
Publisher:
ISBN:
Category :
Languages : en
Pages : 420
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Book Description
This dissertation was concerned with a study of operational controls on urban freeways. An analysis was made of the inbound Gulf Freeway to define the operational problems resulting from vehicular incidents. It was found that significant congestion, delay, and stoppage waves frequently occur on the inbound Gulf Freeway because of the reduction in capacity caused by incidents on the main-lanes. Approximately 80 percent of the incidents reduce the inbound freeway capacity by one-half or more; about 13 incidents per week occur in the study section Monday through Friday from 6 a.m. to 7 p.m. A design concept of a prototype was formulated to increase freeway efficiency by alerting motorists to stoppage waves on freeway sections such as overpasses having restricted sight distances. The prototype was referred to as a safety warning system. It is anticipated that the improved efficiency will result in fewer accidents; reduced system travel time, driver anxiety, and driver discomfort; and improvement in the level of service. Several design alternatives were evaluated. A control technique utilizing critical energy as a parameter was developed and its application to digital computer control of the prototype was investigated. Evaluations were made of the performance, reliability, stability, and sensitivity of the system using a one-lane criterion for control. ...
Author: Jin J. Wang
Publisher:
ISBN:
Category : Express highways
Languages : en
Pages : 338
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Book Description
Author: Paul F. Everall
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 190
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Book Description
Describes freeway conditions which are subject to improvement by means of electronic surveillance and control. Ramp metering is presented along with a benefit-cost analysis of its effectiveness.
Author:
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 38
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Book Description
Inventory forms were prepared and tested by the Freeway Operations Committee of the Department of Traffic and Operations of the Highway Research Board, and transmitted to all state highway departments and to various toll facility authorities. A digest and summation are presented of inventory items for 20-25 agencies reporting some form of freeway surveillance and operational control activities. The digest is presented as reported by states. Tables are presented with inventory data tabulated by: (1) method of traffic data acquisition, telemetry and processing, (2) technique of traffic surveillance, (3) type of operational controls, (4) type of motorist aid, and (5) availability of material and technical reports.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 80
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Book Description
Author: David R. Howarth
Publisher:
ISBN:
Category : Express highways
Languages : en
Pages : 260
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Book Description
Author: Jack E. Eckhardt
Publisher:
ISBN:
Category : Express highways
Languages : en
Pages : 54
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Book Description
Author: Joseph A. Wattleworth
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 61
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Book Description
Author:
Publisher:
ISBN:
Category : DYNASMART (Computer file)
Languages : en
Pages : 140
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Book Description
The main focus of this study is congestion, primarily that occurring on freeway corridors in metropolitan areas. Lack of coordination in the operation of various components of the system is often a major source of inefficiency, resulting in greater delays to motorists than what might be achievable with the existing physical infrastructure. The main objective of the study is to improve corridor network management by coordinating the various control elements in a freeway corridor, for both recurrent and nonrecurrent congestion situations.
