U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
This diagram depicts the steps necessary to address Intersection Safety, as follows:
Step 1: Identify Intersection Safety Issues (Manual: Section 2)
Safety issues can be identified by collecting crash history, roadway, and exposure information from the following sources:
Step 2: Record Information for Safety Analysis (Manual: Table 1)
Compile information in a table that includes the source of the information, the type of problem, and other attributes of the crash, observation, or notification.
Steps 3 and 4: Data Analysis, Countermeasure Selection, and Installation
Depending on the approach, the order of data analysis, countermeasure selection, and countermeasure selection may vary.
The possible approaches that can be taken are either:
For the spot location approach and Systematic approach (crash type focus), steps 3 and 4 are presented below in a side-by-side format:
| Spot Location Approach and Systematic Approach (Crash Type Focus) |
Systematic Approach (Countermeasure Focus) |
|---|---|
Step 3: Analyze Data (Manual: Section 3) Data can be analyzed in the following ways, based on the available information:
|
Step 3: Select Countermeasure (Manual: Section 4) Develop a list of countermeasures and thresholds for their application (e.g., crash frequency, crash type, traffic volumes). |
Step 4: Select and Install Countermeasures (Manual: Section 4) Details from crash data and analysis feeds the countermeasure selection process.
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Step 4: Analyze Data and Install Countermeasures (Manual: Sections 3 and 4)
|
Step 5: Assessment and Follow-up (Manual: Section 5)
Evaluate intersection safety treatments after installation.
