Traffic-safe and hydraulically efficient drainage practice.

This publication presents the four principal objectives for providing safer roadsides as applied to drainage structures. In order of priority, they are: 1. Unnecessary drainage structures should be eliminated; 2. Necessary drainage structures should be located so that they create the least possible hazard; 3. Structures which cannot be eliminated or redesigned should be modified to inflict minimum damage; 4. Where the first three objectives cannot be feasibly accomplished, guardrail should be installed.