Transportation Analysis & Querying Application
TAQA makes a range of transportation data easily accessible to member agencies and the general public. The goal is to help make informed decisions regarding transportation infrastructure and to assist in the project development process.
Who Uses TAQA
TAQA is available to all users and does not require a login or special permission. Advanced features are available to member agencies through the login feature. This may be obtained by requesting a password from MRCOG staff.
Data Currently Available Through TAQA
Travel time - Data may be queried for individual date(s) or to determine average conditions across a longer period of time, such as all weekdays in a month. The data is available by direction for individual roadway segments (i.e. a section of road generally from one intersection mid-point to another intersection mid-point). Travel time data is obtained from INRIX, a commercial vendor that aggregates data from a range of mobile devices. Travel time data may be queried for the years 2011, 2012, 2013, and 2014.
Traffic counts - Data is collected by MRCOG for segments of every federal-aid eligible road (i.e. all roadways classified as collectors or above) using portable traffic monitoring devices with rubber tubes that stretch across the roadway (tube counters). All major roads are counted once every three years. Additional data is collected through a series of permanent count stations, mostly on Interstates. Data is collected across two 24-hour periods to produce average daily and peak period traffic volume levels, as well as directional split values (the percentage of travel in a peak direction for the day or peak period). The observed data differs from Average Weekday Daily Traffic (AWDT) because it reflects a point in time rather than an annual average. Only the most recent observed traffic counts data for each segment can be found in the TAQA.
Average Weekday Daily Traffic (AWDT) - Refers to the traffic volume along a roadway segment in an average 24-hour weekday. A seasonal and annual adjustment factor is applied to the observed traffic counts data to determine the AWDT for an individual year. TAQA currently contains an inventory of AWDT values from 2000-2015.
Guidance for Using TAQA
TAQA utilizes data from INRIX, a commercial vendor that aggregates information from a range of sources, although the sample size is unknown and data is not currently available for all links. To determine whether data exists for a particular roadway, refer to the “INRIX Coverage Area” map layer in the TAQA tool. Additional travel time data from “floating car” surveys can be found here.
INRIX relies on a combination of observed data at the point and time in question and historical reference data. The data is most reliable when assessing longer stretches of a roadway, and is particularly useful in determining relative differences across locations - through measures such as Travel Time Index - or for evaluating conditions in the same location at different times of the day or parts of the year.
Traffic counts data is for a point in time. The filter tool can be applied geographically - that is, for individual corridors or road segments within a political boundary - but it cannot be applied to certain dates or times. Only the travel time data can be queried by date in the application.
Upcoming Data Additions
- 2015 and 2016 travel time data (INRIX)
- Traffic counts data - updated on a regular basis
Additional Travel Time Data
MRCOG has also developed an archive of travel time data collected using GPS-based vehicle probe or “floating car” surveys conducted from 2010 to 2012. This approach to travel time data collection relies on private vehicles equipped with GPS devices that travel with the flow of traffic. Travel time data was collected for corridors along the CMP network in each peak period (a.m., p.m., off peak) and is available at the link level. While this approach is particularly effective at observing data for specific dates and points in time, it is comparatively expensive and results in a limited sample size. However, floating car surveys are effective at capturing delay associated with individual intersections, particularly on individual dates.