Roadway Safety Information Analysis: A Manual for Local Rural Road Owners

Table of Contents

Long Description for Figure 1. Data Collection and Analysis Steps

Flow diagram describes the steps to be taken in collecting and analyzing data, as follows:

Step 1: Collect Safety Roadway, and Exposure Information (Manual: Section 2).

Information can be collected from:

• State and national crash databases
• Law enforcement crash reports
• Hospital records
• Observations by law enforcement and public works staff
• Public notifications
• State and local roadway databases
• Traffic count records

Step 2: Record Inforamtion for Safety Analysis (Manual: Table 1)

Compile information in a table to determine if patterns emerge and to track responses to known crash locations.

Step 3: Analyze Data (Manual: Section 3)

Data can be analyzed in the following ways, based on available information:

• Crash frequency
• Crash averaging
• Trend analysis
• Crash rate calculations
• Identification of potential future crash locations

Step 4: Select Countermeasures (Manual: Section 4)

Details from the crash data can provide clues about what treatments are the most appropriate. Based on the availability of data, different approaches can be taken:

• Systematic approach
• Spot location approach
• Comprehensive approach

Return to Figure 1.