01371392

Component

Access management techniques play an important role in roadway safety and mobility on a roadway network. The access provided by streets and highways to adjacent lands is managed by controlling the spacing between the access points including signals, driveways, and median openings on mid-block segments. The objective of this study was to evaluate the safety impact of selected access management techniques in urban areas. The target network was located in the Las Vegas Metropolitan area; about 400 mid-block roadway segments were selected. Statistical tests indicated that there exists interdependency between safety and mobility - a statistical problem known as endogeneity. Also, mid-block segments of the same arterial were found to share common unobserved information, leading to another statistical problem known as heterogeneity. In order to correct the endogeneity between safety and mobility for heterogeneous mid-block segments, simultaneous equation models were adopted within the panel data modeling structure. The panel data structure of the model was used to address the heterogeneity issue for mid-block segments on a corridor. The models developed were used to identify influential factors. The length of mid-block segments, driveway density, and median opening density were among the significant factors found to influence crash rate on mid-block segments.

This paper was sponsored by TRB committee ANB20 Safety Data, Analysis and Evaluation

01362476

12-0784

English

25p

2012

Transportation Research Board 91st Annual Meeting

Digital/other

Figures; References; Tables

Access control (Transportation); Geometric segments; Heterogeneity; Highway safety; Mathematical models; Simultaneous equations; Urban areas

Endogeneity

Las Vegas Metropolitan Area

Highways; Operations and Traffic Management; Safety and Human Factors; I85: Safety Devices used in Transport Infrastructure

Transportation Research Board Annual Meeting 2012 Paper #12-0784

TRIS, TRB

Feb 8 2012 4:57PM