This report describes the enhancements to the video data collection of the Berkeley Highway Laboratory (BHL), a unique surveillance system on a section of I-80 freeway in the city of Emeryville. We also present the development of advanced machine vision algorithms to process the video data to generate vehicle trajectories. A pilot application of the BHL system produced trajectories of over 4700...

Work zones in the United States have approximately 700 traffic-related fatalities, 24,000 injury crashes, and 52,000 non-injury crashes every year. Due to future highway reconstruction needs, work zones are likely to increase in number, duration, and length. This study focuses on analyzing the effect of work zone duration mainly due to its policy-sensitivity. To do so, we created a unique datas...

Safety performance functions (SPFs), by predicting the number of crashes on roadway facilities, have been a vital tool in the highway safety area. The SPFs are typically applied for identifying hot spots in network screening and evaluating the effectiveness of road safety countermeasures. The Highway Safety Manual (HSM) provides a series of SPFs for several crash types by various roadway facili...

This annotated bibliography summarizes studies of the rural economic development implications of highway investment. Primary emphasis is on research dealing with rural areas, but some urban studies are also cited. Topics covered include the aggregate economic effects of highway investment, the effects of highway investment on business location decisions and employment expansion, the effects of ...

The core methodology of the Highway Capacity Manual (HCM) 2010 for freeway analyses is based on Free-Flow Speed (FFS). Moreover, weaving segments are major elements of freeway facilities that form where two one-way traffic streams intersect by merging and diverging maneuvers. Hence, this study used three different methods to compute FFS of a ramp-weaving segment, and then employed the proposed ...

Understanding the influence of intersections on operating conditions along connecting roadway segments is important for analysis highway facilities and corridors. This study aims at assessing area signalized stop-control rural The used speed as a performance measure in examining spatial extent operational effects intersections. High-fidelity connected vehicle (CV) trajectory data, collected 11 ...

This paper concerns the exploration of statistical modelling tools for the analysis of observational freeway ow data, and the development of empirical models to capture and predict short-term changes in tra c ow characteristics on sequences of links in a partially detectorised freeway network. A rst set of analyses explores regression models for minute-by-minute tra c ows, taking into account t...

Traditionally, the 85th percentile of observed speeds is used to represent operating speed associated with a specific site certain geometric features. The presence sunlight enhances vision drivers during daytime while visibility usually degrades nighttime, especially on rural roads where no street lighting exists, and would depend solely their vehicle headlights. Visibility degradation safety c...

The next several years will see an acceleration of the adoption of intelligent driving aid devices. Studying the impact of such devices on the overall traffic performance and safety requires highly realistic microscopic traffic simulation models, which account not only for the overall traffic flow, but also for the details and variability of the individual driver’s behavior. In this paper, we f...