Iowa Department of Transportation's Intelligent Transportation System (ITS) Detector Sensors. Sensor Feed: Includes location of sensors, current travel speed, traffic counts, occupancy counts, and more.Work Zone Alert Feed: Includes work zones that have dropped below the normal speed and are determined to have a critical traffic speed abnormality.

Live traffic data from Roadway Weather Information System (RWIS) sites in Iowa. Any field of NA or 9999 describes an invalid value being sent from sensor and was excluded for this REST service. This data gets updated every 5 minutes.

Locations of Continuous Counting Stations (CCS), also known as Automatic Traffic Recorders (ATR), and manual counts. CCS's record traffic data throughout the year while manual counts are conducted annually in a different quadrant of the state and in each major metropolitan area.

A SHSP (Strategic Highway Safety Plan) is a statewide-coordinated safety plan that provides a comprehensive framework for reducing highway fatalities and serious injuries on all public roads. The SHSP strategically establishes statewide goals, objectives and key emphasis areas developed in consultation with federal, state, local and private sector safety stakeholders. The SHSP plan process is a requirement of the Federal Highway Administration's Highway Safety Improvement Program (HSIP). In general, the federal HSIP requires that state transportation departments develop an SHSP that: includes consultation from a variety of stakeholders during the development process, analyzes and makes effective use of crash data, addresses the 5Es (engineering, enforcement, education, emergency services and everyone) plus management and operations, considers the safety needs of all public roads, describes a program of projects or strategies to reduce or eliminate safety hazards, is implemented and evaluated. This dataset provides traffic data used for most current SHSP.

General vehicle-specific data from the prior 10 years. Data compiled in this format for the Traffic Safety Data and Analysis website (www.iowadot.gov/tsda). Metadata available here.

Annual Average Daily Traffic (AADT) volume information for each centerline segment in the State of Iowa.

Service is not authoritative and is subject to change. Click Here for the authoritative Traffic Service.Traffic volume information for each centerline segment in the state of Iowa. For additional information about a specific volume contact the Office of Systems Planning's Cartography and Traffic team at 515-239-1664.

Several layers were examined as part of the highway improvement needs analysis conducted for the 2017 State Transportation Plan. Future capacity needs on the Primary Highway System were evaluated for the year 2040 with the Iowa Travel Analysis model (iTRAM). A volume-to-capacity (V/C) ratio was used, which divides the roadway’s forecast traffic by its capacity. A corridor is targeted to have a capacity need if the majority of its V/C values exceed 0.7, which is considered to be approaching capacity. Needs were identified at the corridor level; spot locations, generally defined as 0.5 miles in length, were not included as corridors. For more information, see iowadot.gov/iowainmotion.

Iowa Department of Transportation's Intelligent Transportation System (ITS) CCTV Cameras. Includes location of cameras, static image URL, and motion video URL where available. This data gets updated once a day.

Several layers were examined as part of the highway improvement needs and risk analysis conducted for the 2022 State Transportation Plan. Identifying safety risk for the primary highway systems was analyzed through the use of Safety Performance Functions (SPFs) and the subsequent output of Potential for Crash Reduction (PCR). An SPF is an equation used to predict the average number of crashes per year at a location as a function of exposure and, in some cases, roadway or intersection characteristics. Generally, SPFs more realistically demonstrate the relationship between crashes and traffic volume. SPFs account for the regression to the mean by using an Empirical Bayes statistical method. The advantages of using this method are more accurately calculating the potential for safety improvement and acknowledging the complex, non-linear relationship between crash frequency and volume. For any given segment, the potential for crash reduction (PCR) can be determined by evaluating the predicted number of crashes for the location based on volume. This is based on the functional form of the SPF. The predicted number of crashes for a given site is adjusted by the Empirical Bayes method which adjusts the prediction based on the observed crashes at a site. The difference between the corrected number of crashes with the Empirical Bayes and the predicted number of crashes based on the SPF is considered PCR.For the State Long-Range Transportation Plan SLRTP ten different SPF models (and 29 sub models) based on roadway characteristics were developed to evaluate and predict the number of crashes on Iowa’s primary highways. Subsequently, PCR values were calculated for each segment. The results were aggregated to the defined primary highway corridors established by the Systems Planning Bureau. In evaluating safety risk for the purposes of the SLRTP we normalized the PCR per year by the segment or corridors length.Note: this dataset supersedes SCOPING_MOBILITY_AND_SAFETY_RETIRED, effective with the publication of the State Long Range Transportation Plan (SLRTP) and Freight Plan update in 2022.

This service uses a thematic legend to depict the information in the current Traffic Log Book.

Provides a real-time dashboard of current and historical EIN events managed by the TMC.Dashboard is available here

Dataset provides data from the Iowa Department of Transportation's Intelligent Transportation System (ITS) CCTV Cameras. Data includes location of cameras, static image URL, and motion video URL where available.

This is an older map which provides an estimate on the amount of real-time data that is available statewide using INRIX data.Dashboard available here

This layer contains all the current traffic impediments in Iowa provied by the Live Advanced Transportation Management System (ATMS) Data at Iowa DOT.

This product is used primarily for planning purposes to identify and examine corridors and their access priority classifications and how those current classifications are functioning with relation to reported crash history and traffic volumes.

Map showing Continuous Count Sites (CCS) with reference posts and transportation districts.

Traffic turning data (AADT) for years between 1998 and 2018.

Person specific data from the prior 10 years. Data compiled in this format for the Traffic Safety Data and Analysis website (www.iowadot.gov/tsda). These point features depict the last 10 years of crash data and data that is related to injured person information. Data is updated monthly. Metadata available here.

This dataset provides information related to the Iowa Department of Transporation's Intelligent Transportation System (ITS) Digital Message Signs (DMS) devices.