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Crash Rate

This documentation explains the purpose, methodology, and user steps required to run crash rate analyses within TES.

🧭 What Is the Goal of This Module?​

The Crash Rate module is a network screening tool in TES used to identify and rank non-signalized intersections by safety risk. It calculates and compares crash rates over time to help prioritize sites for review or intervention.

📐 Methodology: How Crash Rate Is Calculated​

TES uses a standard crash rate formula:

Crash Rate = (Number of Collisions / AADT) × 1,000

Where:

  • Collisions = Number of reported collisions at a location in a year
  • AADT = Annual Average Daily Traffic for that location

Each crash rate is calculated per year and then averaged over the selected time period.

Example:​

If a site had crash rates of 0.60, 0.90, and 1.20 over three years, the average crash rate would be:

(0.60 + 0.90 + 1.20) / 3 = 0.90

TES then ranks each location by this average. This helps municipalities prioritize their top concern areas

User Guide​

1. Access Network Screening​

  • Navigate to Safety > Network Screening .

  • Create or select an existing Network Screening Project

2. Add a Crash Rate Analysis​

  • Click the + Analysis button

  • Enter a Title

  • Choose Crash Rate as the Analysis Type

  • Click Add

3. Configure Crash Rate Analysis​

  • Click on the row to open the newly added analysis

  • Under Crash Rate Settings , confirm:

    • The Title

    • Selected Years

    • Initial Impact Types

    • Classification (Fatal, Injury, PDO)

4. Run Analysis​

Once fields are complete, click the save button to process your request.

You’ll see a green message:

“We are currently analyzing your request. You will receive an email shortly with the result update.”

5. View Results​

TES displays the following fields:

  • Rank – Position in the risk ranking (1 = highest crash rate)

  • Yearly Crash Rate Columns – Individual crash rates for each selected year

  • Average Crash Rate – Calculated average over selected years

6. Export Results​

Click the Export icon to download either all rows or only selected rows as an Excel file.

7. Map View​

  • Switch to the Map tab to see the ranked sites visualized by color:

    • Red / Dark brown – Lower risk

    • Green / Yellow – Higher risk

    • Legend shows crash rate thresholds

    This visual layer helps identify hotspots and make data-driven intervention decisions.