Title

IMPLEMENTATION OF WIDER LANE LINES TO IMPROVE SIGHT DISTANCE FROM OPPOSING LEFT-TURN LANES

Document Type

Journal Article

Publication Date

2000

Subject Area

operations - traffic, infrastructure - bus/tram lane

Keywords

Width, Sight distance, Regression analysis, Regression, Opposing traffic, Left turn lanes, Lane markings, Lane lines, Before and after studies

Abstract

Vehicles turning left at intersections from opposing left-turn lanes often restrict each other's sight distance. Previous research has developed guidelines for offsetting opposing left-turn lanes to provide adequate sight distances. Implementation of these guidelines at existing intersections typically involves reconstructing the left-turn lanes. However, the results of the before-and-after studies presented demonstrate that increasing the width of the lane lines between left-turn lanes and the adjacent through lanes also can be used as a means of improving the sight distance between opposing left-turn lanes. Regression analysis was used to determine a relationship between lane-line width and available sight distance that can be used to design lane-line widths that provide the required sight distance for opposing left-turn vehicles.