CMAP is developing performance measures, internal processes, and partnerships with other agencies to assure that transportation funds are not allocated based on arbitrary formulas, but on performance data.  A performance-based funding system will be more likely to identify and mitigate transportation system deficiencies than fixed allocation processes.  CMAP is committed to working with implementers to develop a transparent programming process that allocates funding efficiently to maintain a world-class multi-modal transportation system.  For more information, see CMAP's summary of the performance-based funding concept.  Transportation performance measures and their application to improve the programming processes for the region are key elements of CMAP's Congestion Management Process

Expressway Atlas. In addition to the performance measures below, researchers and the public may be interested in the 2012 Expressway Atlas and its 2014 Update.  The Atlas includes system data, daily and monthly factors, AADT tables, hourly percent tables, and detailed traffic flow graphics.  The 2014 Update includes updated graphics of the link-by-link and ramp-by-ramp traffic volume estimates using highly detailed corridor-level drawings.

2012 Expressway Atlas (Links to CMAP Data Hub, where the document is posted)

2014 Expressway Atlas Update (Links to CMAP Data Hub, where the document is posted)

The Atlas is posted in sections at http://www.cmap.illinois.gov/mobility/roads (under Road Resources).

CMAP has embarked on a project to prepare transportation facility performance datasets for application to performance-based programming.  The datasets provide information at the facility level, and span a variety of interest areas, including safety, system preservation, mobility, travel time reliability, and accessibility.  

Below are three highway performance maps showing data related to mobility and travel time reliability.

Travel Time Reliability: Highways: Planning Time Index, Chicago Region, 2012

Mobility: Highways: Intensity of Congestion:  Travel Time Index, PM Peak Period, Chicago Region, 2012

Mobility: Highways: Duration of Congestion: Congested Hours, Chicago Region, 2012

Accessibility: Walking and Cycling: Land Use Diversity, 2005

Accessibility: Walking and Cycling: Pedestrian Environment Factor

Below is a map provided for background.  

Free-Flow Speeds.  The performance maps above rely on a concept of "free-flow travel time" to compare to congested conditions.  In the Chicago region, we measured the free-flow travel time based on average speeds from 8 pm to 5:30 am.  Free-Flow Speeds, Chicago Region, 2012.

This performance measure category includes analyses of data on crashes, injuries, and fatalities.

Motor Vehicle Casualties. The measures below show various aspects of the level of motor vehicle casualties. The data is for the seven-county area.

Source: CMAP, calculated from IDOT and US Census Bureau Data.  2013 data is expected to be released in late 2014.

Additional safety performance measure rates have been prepared for each county and the City of Chicago by mode of travel.  Regional Highway Safety Performance by Location, Year, Mode of Travel, and Casualty Level, 2002 - 2012.

This performance measure category includes analyses of data on the maintenance and state of repair for transportation assets in the region.

Ride Quality: Principal Arterials.  Acceptable ride quality on the region's highways is measured by the International Roughness Index (IRI).  IRI is the change in longitudinal profile, measured as meters per kilometer.  The GO TO 2040 target for 2015 is 65%; the year 2040 target is 90%. 

Source: Calculated by CMAP from IDOT Data

Bridge Conditions: Structurally Deficient.  "Structurally deficient" is a measure of highway bridge structural health.  This information is generated from detailed structural evaluations gathered as part of bridge inspections.

Source: Calculated by CMAP from FHWA National Bridge Inventory Data.  The year indicates the year of the file, reflecting data collected through the previous year. 

Bridge Conditions: Not Deficient.  "Not Deficient" measures highway bridges that are neither "structurally deficient," as shown above, nor "functionally obsolete."  The GO TO 2040 target for 2015 is 70%; the year 2040 target is 80%. 

Source: Calculated by CMAP from FHWA National Bridge Inventory Data

Transit.  The above measures originate from periodic system-wide highway asset condition assessments.  Such measures do not exist for the transit system.  Development of such measures is a priority.

This performance measure category includes analyses of data on the impacts of incidents and daily variation on travel times and the extra time required by travelers to arrive "on time."

Planning Time Index.  This is a measure of travel time reliability.  It is the ratio of the total time needed to ensure a 95% on-time arrival to the free-flow travel time.

Source: Federal Highway Administration.

Average Weekday Motorist Delay at Highway-Rail Grade Crossings.  This is a measure of the delay associated with railroad grade crossings.  GO TO 2040 established targets of <10,000 hours per weekday by 2015, and <5,500 hours per weekday by 2040.

Source: Illinois Commerce Commission. N.A. means "not available." 

Metra On-Time Performance.  This is a measure of on-time performance of Metra commuter rail services.  This is calculated by Metra. 

Source: Metra.  See the Metra website.

Pace On-Time Performance.  This is a measure of on-time performance of Pace Suburban Bus Services.  This is calculated by Pace. 

Source: Pace Annual Reports.  N.A. means "not available." 

CTA Monthly Rail Delays of 10 Minutes or More.  This is a measure of on-time performance of Chicago Transit Authority rail services. 

Source: Calculated by CMAP from data at CTA Performance web page.  N.A. means "not available." 

CTA Percent of Bunched Bus Intervals, 12-Month Average.  This is a measure of on-time performance of Chicago Transit Authority bus services.

Source: Calculated by CMAP from data at CTA Performance web page.  N.A. means "not available."  

This performance measure category includes analyses of data on congestion, travel times, and vehicle miles traveled on the region's transportation networks.

Travel Time Index, Limited Access Highways.  This is a measure of congestion.  It's defined as the ratio of peak-period travel time to free-flow travel time. Peak-period is 6-9 am and 4-7 pm.  Data for individual facilities is on our scans page. 

Source: Federal Highway Administration

Congested Hours per Day, Limited Access Highways.  This measures the number of hours per day during which at least 20% of the vehicle-miles are traveling at congested speeds (less than 45 mph).  The GO TO 2040 target is no growth in congested hours.  Data for individual facilities is on our scans page. 

Source: Federal Highway Administration

This performance measure category includes analyses of data on both the access of goods and services for economic development and the access of people to institutions and commerce for community development.

Vehicle Miles Traveled (VMT) per Year per Capita (AADT-Based).  This measures travel demand.  Higher VMT sometimes explains greater congestion.  For this measure, IDOT calculates total VMT by factoring traffic counts on regional roads.  This measure includes all highway travel, including through trips and external travelers in the region.

Source: CMAP, calculated from IDOT and US Census Bureau Data.

Motor Vehicles per Household.  This measures travel demand.  Higher vehicle ownership sometimes explains greater congestion.

Source: CMAP, calculated from US Census Bureau Data.  N.A. means "not available."  2012 data is expected to be released on September 19, 2013.

Unlinked Transit Passenger Trips per Household.  This measures transit travel demand.  Higher transit trips may dampen highway travel demand. 

Source: CMAP, calculated from Federal Transit Administration's National Transit Database.  N.A. means "not available."  2012 data is expected to be released in 2013.