Mitigation Strategies for Design Exceptions - July 2007
Table of Contents
Introduction to Mitigation Strategies for Design Exceptions
Chapter 1 - Design Exceptions
Why are Design Exceptions Needed?
Where are Design Exceptions Required?
Sources of Highway Geometric Design Criteria
Nominal and Substantive Safety
Comparing Nominal and Substantive Safety
Resources to Support Substantive Safety Analysis and Decision Making
Chapter 2 - The Design Exception Process
1. Determine the Costs and Impacts of Meeting Design Criteria
2. Develop and Evaluate Multiple Alternatives
4. Evaluate Mitigation Measures
5. Document, Review, and Approve
6. Monitor and Evaluate In-Service Performance
Chapter 3 - The 13 Controlling Criteria
Traffic Operational and Safety Effects
Chapter 4 - Mitigation Strategies
2. Lane Width and 3. Shoulder Width
5. Horizontal Alignment and 6. Superelevation
12. Lateral Offset to Obstruction
Chapter 5 - Case Study 1 - Interstate 235 Reconstruction
Project Description and Context
Chapter 6 - Case Study 2 - Tensleep-Buffalo Highway - US16
Project Description and Context
Chapter 7 - Case Study 3 - State Route 99 Reconstruction
Project Description and Context
Chapter 8 - Case Study 4 - State Route 110 - The Arroyo Seco Parkway
Project Description and Context