Author: Wolfgang S. Homburger Publisher: ISBN: Category : Climbing lanes Languages : en Pages : 62
Book Description
This report summarizes an investigation of potentially hazardous conditions at the upper end of climbing lanes on two-lane roads in Northern and Central California. It was postulated that, at such locations, there might be sideswipe accidents involving merging vehicles or head-on collisions of a vehicle swerving across the centerline to avoid such a sideswipe with a vehicle traveling in the opposite direction. Accident records covering five years at 21 potentially hazardous locations revealed that there are very few accidents directly related to the merging maneuver. Only 11 accidents at six locations were identified. The report suggests three guidelines for the location and design of climbing lanes to be considered in addition to those found in other literature. However, the general conclusion is that the merging areas at the terminals of climbing lanes on two-lane roads do not present a hazard of major proportions.
Author: Wolfgang S. Homburger Publisher: ISBN: Category : Climbing lanes Languages : en Pages : 62
Book Description
This report summarizes an investigation of potentially hazardous conditions at the upper end of climbing lanes on two-lane roads in Northern and Central California. It was postulated that, at such locations, there might be sideswipe accidents involving merging vehicles or head-on collisions of a vehicle swerving across the centerline to avoid such a sideswipe with a vehicle traveling in the opposite direction. Accident records covering five years at 21 potentially hazardous locations revealed that there are very few accidents directly related to the merging maneuver. Only 11 accidents at six locations were identified. The report suggests three guidelines for the location and design of climbing lanes to be considered in addition to those found in other literature. However, the general conclusion is that the merging areas at the terminals of climbing lanes on two-lane roads do not present a hazard of major proportions.
Author: Madaniyo Mutabazi Publisher: ISBN: Category : Roads Languages : en Pages : 218
Book Description
Existing passing lanes in place on Kansas highways were studied from an operational and safety perspective. It was found that they generally operated well, improved operational efficiency and were well liked by the public. Determination of highway segments that would need passing lane(s) to improve their operational performance should be accomplished in a two-level process; i.e., Network and Project Level. At the Network Level, two-lane rural highway segments that operate at a level-of-service below a predefined acceptable level are identified. At the Project Level, highway segments identified at the network level are ranked for the purpose of prioritization. The number of highway segment passing lane projects to be implemented will depend on the funding level. At the project level, a detailed economic analysis of different passing lane lengths, spacing, and configurations can be undertaken to set parameters with an objective of minimizing percent time delay. Computer simulation using TWOPAS is a valuable tool to use at this level. The location of passing lanes should be planned along with their spacing. The location guidelines are based in part on the results of field studies, engineering judgement, and "common sense." The location guidelines can be grouped into four main considerations: safety, improved traffic performance, a design consistent with driver's expectation, and minimized construction costs. Spacing between any two successive passing lanes is intended to make the passing lanes function as a coordinated system. The effective length of a passing lane depends on traffic volume and composition, passing lane length, and downstream passing opportunities. The report also addresses the geometric elements relating to passing lanes, including lane and taper length and cross sections, and pavement marking and signing.
Author: National Research Council (U.S.). Transportation Research Board Publisher: Transportation Research Board National Research ISBN: Category : Transportation Languages : en Pages : 152
Author: J. L. Gattis Publisher: ISBN: Category : Highway capacity Languages : en Pages : 158
Book Description
Many of the currently recommended saturation flow values used to determine the congestion level on a roadway are based on data collected in urban area traffic streams; therefore the resulting computational values reflect urban conditions. This project summarized existing research to offer alternative saturation flow rates that reflect rural conditions. It investigated a number of topics pertaining to rural area capacity and congestion. The issues considered were related to freeways, signalized intersections, two-lane road passing and climbing lanes, and access design. The project reviewed existing passing/climbing lane simulation packages, and examined certain volume, headway, and passing behaviors. The practice of assuming less than five second headways constitute delay was tested, and found to be questionable under certain circumstances. The performances of three different arterial street access designs in a small city were compared. The accident rates and travel time delays varied according to the level of access control present. The arterial with the most access control had a considerably lower accident rate than the other two arterials.
Author: Wolfgang S. Homburger
Author: Wolfgang S. Homburger
Author: John R. McLean
Author: 
Author: Madaniyo Mutabazi
Author: 
Author: National Research Council (U.S.). Transportation Research Board
Author: Institute of Transportation Engineers. Meeting
Author: J. L. Gattis
Author: