This record includes 15 papers that explore vulnerable sections of a national road network, the breakdown in merging sections of urban expressways, traffic diversion effect of ramp metering, modeling freeway diverging behavior, queue size estimation, and the benefits of a systemwide adaptive ramp-metering strategy. This issue of the TRR also examines the effect of detector spacing and sample size on the accuracy of freeway congestion monitoring, Amber alert messages, open road tolling, freeway bottleneck simulation, real-time screening of freeway traffic data, ramp metering effects on merging operations, safety impacts of a freeway managed-lane strategy, high-occupancy vehicle (HOV) lanes and hybrid vehicles, and simulation analysis of truck-restricted and HOV lanes.