![]() This committee is concerned with all aspects of research in the fields of highway traffic monitoring, including detection, counting, classification, and in-motion weighing of highway vehicles. Transportation Research Board Highway Traffic Monitoring Committee (ABJ35) With an interest in the design, collection, analysis, and reporting of transportation supply and demand data needed for urban and metropolitan transportation planning efforts, this committee is focusing particularly on development of the data requirements of new and innovative techniques for measuring and monitoring the performance of metropolitan transportation systems as well as on evaluation of changes in demographic and urban travel characteristics. Transportation Research Board Urban Transportation Data and Information Systems Committee (ABJ30) Typical checks might include corridor level review for consistency, progression and anomalies, a historcial review of the data (at least 20 years back, possibly more due to the impact of the recession on traffic counts between 20), missing segments in network (especially ramps), and a review to see if the counts were performed properly (were they factored for seasonality/day of week, were they made for at least 24 hours, what are the limitations of the counting technology used). # Reasonableness Checkĭue to the importance of the role of traffic data's use in model validation and model accuracy, it is critical to perform some review of the source data. Vehicle classification data is more difficult to visualize because of the numerous categories and is most frequently depicted using the flow maps, band widths and diurnal distibutions for truck percentages. 28 of the referenced report: ( (opens new window)). The dirurnal aspect of traffic counts is another frequently used tool to understand traffic data over a 24-hour period or longer periods (an example from Kentucky ATRs is shown on p. Traffic data is also frequently shown in band widths to show the relative value of the traffic volumes. Traffic count data is usually viewed in traffic count flow maps (see example from the Kentucky Transportation Cabinet for 2008 ADTs for the City of Lexington, Kentucky ( \_maps/maps/lexington.pdf (opens new window)). Visualization is a critical component of understanding traffic data. Most truck models also use the categories of heavy trucks, light trucks and commercial vehicles. Time of day models also require hourly or period data. #MDOT TRAFFIC VOLUMES MANUAL#Provides Districts with needed expert signal timing and optimization resources.ĭesigns signing plans provides technical assistance to construction and maintenance and monitors, revises, and replaces existing signing.ĭesigns traffic control and pavement marking plans provides technical assistance to construction and maintenance manages "No Passing" zones manages and publishes the Lane Closure Manual and manages traffic impacts.For most travel demand models, a minimum of 24-hour volumes (ADTs) and truck percentages are needed. Signal Operationsĭevelops timing and coordination plans responds to customer inquiries monitors system performance detects operational and maintenance problems (contact) provides quality control and inspection, coordinates signal turn-ons provides arterial modeling services and evaluates arterial performance. Signal Designĭevelops signal plan packages, which includes signal plans, special provisions, and engineering cost estimates. Provide traffic engineering, capacity, and safety analysis for the planning and development of all metro projects Identify and program traffic safety and capacity projects investigate tort claims and lawsuits perform freeway traffic modeling conduct speed studies. Manages and develops the design of all permanent and temporary lighting systems writes agreements for cost, operation, maintenance, and power. Data CollectionĬollects traffic data, which is used for turning movement counts, stop sign delay studies, pedestrian/bicycle counts, and gap studies, as well as calculate Annual Average Daily Traffic (AADT). Metro District Traffic Engineering is primarily responsible for the design, operation and maintenance of the Metro District's traffic control devices and providing traffic engineering support and expertise to other functional offices and road authorities to create a safe and efficient transportation system. ![]()
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