St. Louis, Missouri, United States
Content that references this location
Incident Identification System for Missouri’s I-270 Corridor Reduced Incident Response Times by an Average of 10 Minutes.
METHODOLOGY
MoDOT set performance metrics for each technology and identified the data sources linked to each performance measure, as well as any data limitations or constraints. The agency also…
Content type
Date Posted
04/27/2026
Taxonomy (ARC-IT)
Incident Scene Safety Monitoring (PS07),
Roadway Service Patrols (PS08),
Traffic Incident Management System (TM08),
Wrong Way Vehicle Detection and Warning (TM25)
Geolocation links
Security Upgrades Including Platform Access Gates, Fencing, and Cameras Led to a 42 Percent Reduction in Incidents on Light Rail in the St. Louis Metropolitan Region.
METHODOLOGY
The project had three phases: four stations were completed in Phase 1 (Fall 2024), seven were completed in Phase 2 (Spring 2025), and the remaining 27 in Phase 3 (expected to be complete…
Content type
Date Posted
11/19/2025
Geolocation links
Machine Learning Tool Accurately Predicted 86 Percent of Incidents, With 14 Percent False Positives, on I-270 in St. Louis.
METHODOLOGY
Starting in August 2021, MoDOT evaluated the crash prediction and incident detection algorithms quarterly for their accuracy during peak hours (6 to 9 a.m. and 3 to 6 p.m.), for fatal and…
Content type
Date Posted
07/30/2025
Taxonomy (ARC-IT)
Traffic Incident Management System (TM08)
Geolocation links
Field Study Using Speed Trailer With Red and Blue Lights Resulted in Over 50 Percent Speed Reduction in a Work Zone in the St. Louis Region During Daytime and Nighttime.
METHODOLOGY
A field study was conducted to collect and analyze approximately four weeks of data from a work zone on I-270 westbound, spanning from the Lindbergh Boulevard interchange to Dunn Road…
Content type
Date Posted
03/31/2023
Geolocation links
In St. Louis County, Missouri, full closure of portions of I-64 for two years allowed for an accelerated construction schedule, saving taxpayers between $93 million and $187 million.
Findings
By diverting 98,000 to 120,000 vehicles daily to alternative routes for two years, the impact costs over the normal operational state were $101.5 million.
Had a partial closure system…
Content type
Date Posted
01/02/2013
Taxonomy (ARC-IT)
Traffic Information Dissemination (TM06),
Integrated Decision Support and Demand Management (TM09),
Personnel Device Maintenance (SU13),
Personalized Traveler Information (TI02),
Trip Planning and Payment (TI04),
Broadcast Traveler Information (TI01)
Geolocation links
A Variable Speed Limit (VSL) system on the I-270/I-255 loop around St. Louis reduced the crash rate by 4.5 to 8 percent, due to more homogenous traffic speed in congested areas and slower traffic speed upstream.
METHODOLOGYPost-VSL deployment data from four segments on I-270 during peak periods was used to evaluate mobility outcomes of VSL. To understand operations under virtual pre-VSL operations, the…
Content type
Date Posted
09/20/2011
Taxonomy (ARC-IT)
Variable Speed Limits (TM20)
Geolocation links
The St. Louis Motorist Assist program had a benefit-cost ratio of 38.25:1, with annual secondary crashes lowered by 1,082 and annual congestion costs lowered by $1,130,000.
METHODOLOGYThe benefit-cost analysis used safety data from incidents that occurred from the years 2000-2008 on seven freeways in the metro St. Louis area. The analysis used data that law enforcement…
Content type
Date Posted
04/26/2011
Taxonomy (ARC-IT)
Roadway Service Patrols (PS08)
Geolocation links
Implementation of Predictive Analytics Tools To Identify Crash Risk Locations as Part of the Missouri I-270 Design-Build Project Totaled Approximately $573,000 in Annualized Costs.
The I-270 Predictive Layered Operations Initiative (PLOI) was an effort by the Missouri Department of Transportation (MoDOT) to improve traffic management and enhance roadway safety along the I-270…
Content type
Made Public Date
04/27/2026
Taxonomy (ARC-IT)
Incident Scene Safety Monitoring (PS07),
Roadway Service Patrols (PS08),
Traffic Incident Management System (TM08),
Wrong Way Vehicle Detection and Warning (TM25)
Geolocation links
Using Artificial Intelligence and Machine Learning Solutions for a Median Inventory and Traffic Volume Estimation in Missouri Cost $80,000 and $45,000, Respectively.
Recent trends in big data combined with technological breakthroughs in Artificial Intelligence (AI) and Machine Learning (ML) have the potential to transform transportation planning and operations.…
Content type
Made Public Date
08/27/2025
Taxonomy (ARC-IT)
ITS Data Warehouse (DM01)
Geolocation links
The service patrol program in St. Louis had operating costs of $2,015,378 in 2008, and operating costs of $2,075,839 in 2009.
Motorist Assist is a freeway service patrol program covers all freeway segments in the St. Louis metro area. Initially deployed in 1993 as part St. Louis's overall ITS deployment, Motorist Assist was…
Content type
Made Public Date
04/26/2011
Taxonomy (ARC-IT)
Roadway Service Patrols (PS08)
Geolocation links
Consider Compatibility Across Technology Systems To Achieve Integration.
MoDOT noted lessons learned throughout the four-year project, including the following:
Consider compatibility across technology systems. Each system comes with unique specifications, data…
Content type
Date Posted
04/27/2026
Taxonomy (ARC-IT)
Incident Scene Safety Monitoring (PS07),
Roadway Service Patrols (PS08),
Traffic Incident Management System (TM08),
Wrong Way Vehicle Detection and Warning (TM25)
Geolocation links
Consider the Accuracy Required, Scale of Application, and Nature of the Decision When Applying Artificial Intelligence and Machine Learning Solutions.
Key lessons learned include the following:
Consider the accuracy required, scale of application, and nature of the decision when evaluating AI/ML solutions. MoDOT concluded that AI/ML was most…
Content type
Date Posted
08/27/2025
Taxonomy (ARC-IT)
ITS Data Warehouse (DM01)
Geolocation links
Deploy arterial travel time detection systems incrementally to allow time to identify issues and fine-tune performance.
LESSONS
Chandler, AZ (Bluetooth deployment)
This technology uses a wireless Bluetooth reader to communicate with in-vehicle devices programmed to pair with other Bluetooth devices. Matching…
Content type
Date Posted
11/30/2014
Taxonomy (ARC-IT)
Infrastructure-Based Traffic Surveillance (TM01),
Integrated Decision Support and Demand Management (TM09)
Geolocation links
