TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2103 includes 13 papers that explore calibration of the Highway Safety Manual's accident prediction model for a secondary road network, speed and safety, accident modification functions, elementary units of exposure, identifying crash hot spots, and safety of lane and shoulder width combinations on rural roads. This issue of the TRR also examines the effects of pavement marking retroreflectivity on traffic crash frequency, road data aggregation and sectioning for crash analysis, safety evaluation of curve delineation improvements, microsimulation to study a traffic signal incident reduction function, comparison of simulated freeway safety performance with observed crashes, traffic operation measures in the safety analysis of signalized intersections, and different parameterizations of the varying dispersion parameter as a function of segment length.
    
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