Freeway Speeds and Speed Variations Preceding Crashes, Within and Across Lanes

Relationships between speed choice and crash occurrence have been difficult to identify. This work examines vehicle speeds (and their variations) derived from single loop detectors for several Southern California freeways, within and across freeway lanes, together with corresponding crash data. While a variety of factors clearly influence speed and speed variance, there is no evidence in these crash data sets, and observations of their corresponding series of 30-second traffic conditions, that speeds or their variation trigger crashes

Credit-Based Congestion Pricing: Expert Expectations and Guidelines for Application

Congestion pricing (CP) ensures that travelers recognize the true travel-time costs of their trip- making by accounting for the cost of delays imposed on fellow road users. Credit-based congestion pricing (CBCP) is a novel strategy which seeks to overcome the negative equity impacts of CP by allocating monthly budgets to eligible travelers to spend on congestion tolls. Previous works on CBCP have surveyed public opinion and examined the traffic and travel-welfare impacts of an Austin, Texas, application. This paper develops the CBCP policy further, examining expert opinions and system cost prediction. Transport economists, toll technology experts, administrators, policymakers, and commercial interests were surveyed for feedback on credit distribution, revenue uses, public reaction, appropriate technology and configuration, enforcement issues, and system-wide economic, land use, and business impacts. The results of this work are detailed recommendations for CBCP implementation, including estimates of administrative and technology costs for implementation of a CBCP policy in the Austin region

TRAVEL DEMAND AND THE 3DS: DENSITY, DIVERSITY, AND DESIGN

This paper examines the connection between the 3Ds of the built environment and travel demand. Notably, it tries to sort through the relative influences of the three dimensions after controlling for other explainers, like travellers\u27 demographic characteristics. It does this mainly by applying the technique of factor analysis to gauge the relative influence of each dimension as well as their collective impacts. The paper tests the propositions of the new urbanists and others that compact neighborhoods, mixed land uses, and pedestrian-friendly designs \u27degenerate\u27 vehicle trips and encourage residents to walk, bike, or take transit as substitutes for automobile travel, particularly for non-work purposes

Freeway Speeds and Speed Variations Preceding Crashes, Within and Across Lanes

Relationships between speed choice and crash occurrence have been difficult to identify. This work examines vehicle speeds (and their variations) derived from single loop detectors for several Southern California freeways, within and across freeway lanes, together with corresponding crash data. While a variety of factors clearly influence speed and speed variance, there is no evidence in these crash data sets, and observations of their corresponding series of 30-second traffic conditions, that speeds or their variation trigger crashes