USA Banner
  U.S. flag
              An official website of the United States government Here's how you knowOfficial US Government Icon
              **Official websites use .gov**A **.gov** website belongs to an official government organization in the United States.
            Secure Site Icon
              **Secure .gov websites use HTTPS**
                  A **lock** ( A locked padlock ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. 
 U.S. Department of Transportation Icon United States Department of Transportation
 Search DOT
            Search
                    About FHWAFHWA Organization
                Headquarters Offices
                Field Offices
                Strategic Plan
                Business Opportunities
                Staff Directories
                Careers
                Highway History
                Contact UsProgramsAcquisition Management
                Civil Rights
                Federal Lands Highway
                Infrastructure
                Innovative Program Delivery
                Operations
                Planning, Environment, and Realty
                Policy
                Research, Development, and Technology
                Safety
                Browse by TopicsResourcesCore Highway Topics
                Federal Aid Essentials
                Automation
                Complete Streets
                Laws and Regulations
                Policy & Guidance Center
                Section 508
                Publications and Statistics
                Professional Development
                National Highway Institute
                Resource Center
                Accessibility Resource Library
                FHWA Research LibraryNewsroomPress Releases
                Speeches & Testimony
                Photos
                Videos
                Media ContactsMenu FHWA Highway Safety Programs Home
                        Safety
                        Learn Safety
                        Noteworthy Practices


            
            In This Section
        Learn Safety
                About RSPCB
                Road Safety Fundamentals
                Roadway Safety Noteworthy Practices
                                Search Noteworthy Practices
                Resources
                Training and Education
                                Overview
                Training Opportunities
                Road Safety Course Finder
                NHI Courses
                Roadway Safety Champions
                Get Help
                                Overview
                Technical Assistance Guidelines
                Technical Assistance Online Application
                Safety Data Dashboard
                
                SEMCOG’s Innovative Traffic Data Quality Assurance/Quality Control and Automated AADT Estimation Reduce Labor Costs Associated with Converting and Entering Data
**Publication Year:** 
            2017
    
        Background

This case study highlights two noteworthy practices at the Southeast Michigan Council of Governments (SEMCOG) regarding short-duration traffic count validation procedures and an automated annual average daily traffic (AADT) estimation process. SEMCOG maintains a centralized traffic count database and receives traffic counts from the local agencies in southeast Michigan. SEMCOG conducts 46 validity checks on all traffic count data to identify invalid data available in the database but not adequate for analysis. After implementing the system, SEMCOG reduced labor costs associated with converting and entering data and was able to spend more time analyzing data. SEMCOG developed an algorithm that works inside its geographic information system (GIS) to improve AADT estimates by searching for uncounted segments with nearby counted segments. When a counted segment is identified, the algorithm calculates the weighted average of two nearby segments and assigns that AADT to the uncounted segment. This process was automated using Python scripts, which results in an increase in the number of AADT estimates without requiring additional field data collection.

Read the Case Study Southeast Michigan Council of Governments: Innovative Traffic Data Quality Assurance/Quality Control Procedures and Automating AADT Estimation for more detailed information. U.S. DEPARTMENT OF TRANSPORTATION

**Federal Highway Administration**

1200 NEW JERSEY AVENUE, SE

WASHINGTON, DC 20590

202-366-4000Subscribe to email updates
                    About
  

        
              About FHWA
                Careers
                Org Chart
                Staff Directories
                Work with UsPrograms
  

        
              Acquisition Management
                Civil Rights
                Federal Lands Highway
                Infrastructure
                Innovative Program Delivery
                Operations
                Planning, Environment, and Realty
                Policy
                Research, Development, and Technology
                SafetyPolicies, Rights, Legal
  

        
              About DOT
                Accessibility
                Budget and Performance
                Civil Rights
                FOIA
                Information Quality
                No FEAR Act
                Office of Inspector General
                Privacy Policy
                USA.gov
                Web Policies and Notices
                Web StandardsNews & Events
  

        
              Newsroom
                Press Releases
                Speeches & Testimony
                Media Contacts
                Connect with Us