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Appendixes to NCHRP Report 572: Roundabouts in the United States

This web document contains the appendices to NCHRP Report 572, as follows: Literature Review on Safety Performance, Literature Review of Operational Models, and Statistical Testing of Speed-Based Safety Models.
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Roundabouts in the United States

Methods of estimating the safety and operational impacts of roundabouts are presented and design criteria for them are updated, to help geometric designers and traffic engineers considering improvements to an intersection.
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Development of the Bicycle Compatibility Index

Presently, there is no methodology that is widely accepted by engineers, planners, or bicycle coordinators that will allow them to determine how compatible a roadway is for allowing efficient…
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Highway Design Handbook for Older Drivers and Pedestrians

This project updated, revised, and expanded the scope of the "Older Driver Highway Design Handbook" published by the Federal Highway Administration in 1998, and included recommendations with supporting background material for aspects of modern roundabouts and highway-rail grade crossings.

Accident Modification Factors for Traffic Engineering and ITS Improvements

This report presents the findings of a research project to develop accident modification factors (AMFs) for traffic engineering and Intelligent Transportation Systems (ITS) improvements. AMFs are a…
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DEVELOPMENT OF THE BICYCLE COMPATIBILITY INDEX: A LEVEL OF SERVICE CONCEPT, FINAL REPORT

Presently, there is no methodology widely accepted by engineers, planners, or bicycle coordinators that will allow them to determine how compatible a roadway is for allowing efficient operation of…

Guidelines and Recommendations to Accommodate Older Drivers and Pedestrians

Recommendations are directed toward new construction, reconstruction, scheduled maintenance, and "spot treatments" to ameliorate demonstrated safety problems, emphasizing countermeasures with modest additional cost during installation and the potential for cost savings over the life cycle.

Safety impacts of different speed limits on cars and trucks : final report

The objectives of this study were to determine whether differential or uniform speed limits are more beneficial to transportation safety and traffic operations on Interstate highways. The approach to…

PEDSAFE: PEDESTRIAN SAFETY GUIDE AND COUNTERMEASURE SELECTION SYSTEM

This report is the next generation of the "Pedestrian Facilities User Guide - Providing Safety and Mobility." It includes an update of 47 engineering countermeasures or treatments, along with…

Evaluation of Shared-Use Facilities for Bicycles and Motor Vehicles

This study was conducted for the Florida Department of Transportation with an objective of evaluating the safety and utility of shared-use facilities to provide engineers and planners comprehensive…
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