TRB’s Airport Cooperative Research Program (ACRP) Report 62: Airport Apron Management and Control Programs explores the effectiveness of apron management programs around the world. The report compares and contrasts apron management programs around the world to U.S. airports, while considering the common operational and ownership differences between U.S. and non-U.S. airports.

TRB’s Transportation Research Circular E-C162: Winter Maintenance and Surface Transportation Weather includes papers that were presented at the April 30-May 3, 2012, conference in Coralville, Iowa. Issues addressed by the papers include environmental stewardship and sustainability, road safety under winter conditions, decision support systems, winter surface friction, blowing and drifting snow,...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 716: Travel Demand Forecasting: Parameters and Techniques provides guidelines on travel demand forecasting procedures and their application for helping to solve common transportation problems. The report presents a range of approaches that are designed to allow users to determine the level of detail and sophistication in selecti...

TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 431: Practices to Manage Traffic Sign Retroreflectivity includes examples of practices that illustrate how different types of transportation agencies might meet federal retroreflectivity requirements for traffic signs.

TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 432: Recent Roadway Geometric Design Research for Improved Safety and Operations reviews and summarizes roadway geometric design literature completed and published from 2001 through early 2011, particularly research that identified impacts on safety and operations. The report is structured to correspond to chapters in th...

Roundabouts have seen unprecedented growth across the United States, from just a handful a decade ago to more than 2,000 and counting. National guidance had to keep pace with the needs of states and communities planning and implementing roundabouts, and NCHRP took a lead role.

In regions across the nation, bridge engineers know that the next major seismic event is coming—maybe tomorrow, maybe centuries from now. DOTs have the critical charge of designing for earthquakes and protecting the lives of travelers.

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2265 consists of 28 papers that explore reducing side collisions of transit buses, injury risk in collisions involving buses, prevention of tractor–semitrailer rollovers, large-truck transportation alternatives, evaluating truck safety systems, factors associated with motorcycle crashes, and severity of moto...

TRB’s National Cooperative Freight Research Program (NCFRP) Report 16: Preserving and Protecting Freight Infrastructure and Routes provides guidance to decision makers involved in freight facility operations, freight transportation planning, and land use on how to avoid conflicting land uses or mitigate existing uses. The report provides information about freight transportation and its importan...

TRB’s Airport Cooperative Research Program (ACRP) Research Results Digest 15: Use of Towbarless Tractors at Airports—Best Practices includes broad guidance designed to help enhance the safe operation of towbarless tractors (TBLTs) at airports. The report is designed to assist airports and aircraft operators in gaining a basic understanding of the training and operational issues associated with ...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2259 consists of 24 papers that explore traffic signal control, arterial offset optimization, coordination of arterial traffic signal, arterial signal phases and progression quality, coordinated system operation, the benefit of retiming traffic signals, modeling variability of urban travel times, intelligent...

TRB’s second Strategic Highway Research Program (SHRP 2) has released a Reliability Products Brief, which summarizes the status of products being produced within the Reliability area of SHRP 2. Reliability research in SHRP 2 addresses the root causes of unpredictable travel times by focusing on highway system operations. Travel time reliability, which is valued for many reasons, is co...

TRB’s second Strategic Highway Research Program (SHRP 2) has released a Renewal Products Brief, which summarizes the status of products being produced within the Renewal area of SHRP 2. The goal of Renewal research in SHRP 2 is to advance the methods and materials that transportation agencies can use to renew the nation’s vital but aging highway system even as we continue to use and live n...

TRB’s Airport Cooperative Research Program (ACRP) Report 65: Guidebook for Airport Irregular Operations (IROPS) Contingency Planning is designed to help guide commercial passenger service airports of all sizes to develop, continually evaluate, and update their contingency plans for procedures pertaining to irregular operations (IROPS) that may cause significant disruptions to customers. This gu...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 693: Attracting, Recruiting, and Retaining Skilled Staff for Transportation System Operations and Management provides guidance designed to help transportation agencies recruit and retain qualified professional staff in the systems operation and management (SOM) area. The report explores SOM career paths, skill requirements, and ...

TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 182: Appendices to NCHRP Report 693 includes a set of tables showing systems operations and management job categories, number of positions, and educational requirements for all 50 states. NCHRP Report 693 : Attracting, Recruiting, and Retaining Skilled Staff for Transportation System Operations and Management provides...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2256 consists of 22 papers that explore network stratification method by travel time variation, license plate image binarization, centrality characteristics of road network patterns, commuting mode share, optimal paths in a public transit network, estimating route choice and travel time reliability, travel t...

TRB Transportation Research Record: Journal of the Transportation Research Board, No. 2260 consists of 17 papers that explore travel time variations on urban links, macroscopic fundamental diagrams for freeway networks, traffic flow forecasting and spatial data aggregation, velocity-based first-order continuum traffic model, general newell model and related second-order expressions, and fundame...

TRB Transportation Research Record: Journal of the Transportation Research Board, No. 2257 consists of 14 paper that explore developing capacity models for local roundabouts, speed–flow curves for freeways in Highway Capacity Manual 2010, running time prediction for signalized urban streets, right-turn-on-red volume estimation and incremental capacity for shared lanes at signalized intersection...

TRB’s second Strategic Highway Research Program (SHRP 2) Report S2-L06-RR-1: Institutional Architectures to Improve Systems Operations and Management examines a large number of topics concerning organizational and institutional approaches that might help transportation agencies enhance highway operations and travel time reliability. The same project that produced SHRP 2 Report S2-L06-RR-1 also ...

TRB Transportation Research Record: Journal of the Transportation Research Board, No. 2258 consists of 17 papers that address spatial and temporal speed limit compliance, nighttime luminance of work zone drums, steady-burn warning lights, primary and precipitating factors in work zone crashes, motorist reactions to reduced work zone speed limits, truck-mounted changeable message signs, and work...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 694: Evaluation and Performance Measurement of Congestion Pricing Projects is designed to help transportation agencies select or develop measures to evaluate congestion-pricing projects; collect the necessary data; track performance; and communicate the results to decision makers, users, and the general public. A companion docum...

TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 174: Performance Measurement and Evaluation of Tolling and Congestion Pricing Projects provides an overview of the purpose, scope, and methodology, and a complete compilation of the work products that were used to develop NCHRP Report 694. NCHRP Report 694 : Evaluation and Performance Measurement of Congestion Pricing...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2243 consists of 18 papers that explore reidentification of trucks over long distances, lane-level travel times, private-sector probe-based speed data in the planning processes, travel time estimation enhancement, sustainable urban transport, university students’ acquisition and use of travel information, in...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 707: Guidelines on the Use of Auxiliary Through Lanes at Signalized Intersections provides guidelines to help in the justification, design, and analysis of auxiliary through lanes (ATLs) at signalized intersections. ATLs are lanes for through movements that begin upstream of a signalized intersection and end downstream of the in...

TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 178: Assessment of Auxiliary Through Lanes at Signalized Intersections describes a project that investigated the operational, safety, and design characteristics of auxiliary through lanes (ATLs) at signalized intersections. The project resulted in the development of guidelines for the evaluation and application of ATL...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2250 consists of 10 papers that examine detection distances to crosswalk markings, malfunction flash mode policies and practice, safety effectiveness of actuated advance warning systems, an advance LED warning system for rural intersections, in-lane pavement markings in advance of freeway interchanges, ...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2249 consists of 11 papers that examine wave velocity estimation; non-lane-based car-following model; effects of turning maneuvers and route choice on a simple network; driving behavior, mental workload, and psycho-spacing models in fog; modeling driver behavior at freeway–ramp merges; new model for variable...

TRB’s Innovations Deserving Exploratory Analysis (IDEA) Final Report for Transit IDEA Project 58: Google Transit Data Tool for Small Transit Agencies discusses the process, results, and work effort carried out in creating a tool to have transit information such as routes, start and stop times, trips, fares, and schedules accessible online via Google Transit.

TRB’s Airport Cooperative Research Program (ACRP) Synthesis 29: Ramp Safety Practices addresses the current state of ground handling practices, focusing on safety measures and training. Issues addressed in the report include ramp safety operations, staff roles and responsibilities, safety training, audit and inspection programs, safety violation programs, and collaborative safety initiatives, s...