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FHWA Home / Safety / Geometric Design / Publications / Mitigation Strategies for Design Exceptions - July 2007

List of Tables

Table 1

Ranges for Design Speed

Table 2

Relative Risk of Differential Speed Caused by Changes in Roadway Geometry

Table 3

Ranges for Lane Width

Table 4

Operational Effects of Freeway Lane Widths

Table 5

Operational Effects of Lane and Shoulder Width on Two-Lane Highways

Table 6

Lane Width:  Potential Adverse Impacts to Safety and Operations

Table 7

Ranges for Minimum Shoulder Width

Table 8

Operational Effects of Freeway Shoulder Widths

Table 9

Shoulder Width:  Potential Adverse Impacts to Safety and Operations

Table 10

Bridge Width:  Potential Adverse Impacts to Safety and Operations

Table 11

Horizontal Alignment:  Potential Adverse Impacts to Safety and Operations

Table 12

Accident Modification Factors for Superelevation on Rural Two-Lane Highways

Table 13

Superelevation:  Potential Adverse Impacts to Safety and Operations

Table 14

Accident Modification Factors for Grade on Rural Two-Lane Highways

Table 15

Grade:  Potential Adverse Impacts to Safety and Operations

Table 16

Relative Safety Risk of Various Conditions in Combination with Non-Standard Stopping Sight Distance

Table 17

Stopping Sight Distance:  Potential Adverse Impacts to Safety and Operations

Table 18

Cross Slope:  Potential Adverse Impacts to Safety and Operations

Table 19

Ranges for Minimum Vertical Clearance

Table 20

Vertical Clearance:  Potential Adverse Impacts to Safety and Operations

Table 21

Lateral Offset to Obstruction: Potential Adverse Impacts to Safety and Operations

Table 22

Potential Mitigation Strategies

Table 23

Combinations of Lane and Shoulder Width Considered

Table 24

Types of Before-and-After Data Collected

 

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Page last modified on April 1, 2019
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