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FHWA Home / Safety / Geometric Design / Publications / Mitigation Strategies For Design Exceptions

The 13 Controlling Criteria

 

As discussed in Chapter 1, FHWA has identified 13 design criteria as having substantial importance for the safe and efficient operation of highways.  A formal design exception is required if these controlling criteria are not met on the NHS: 

  1. Design Speed

  2. Lane Width

  3. Shoulder Width

  4. Bridge Width

  5. Horizontal Alignment

  6. Superelevation

  7.  Vertical Alignment

  8. Grade

  9. Stopping Sight Distance

  10. Cross Slope

  11. Vertical Clearance

  12. Lateral Offset to Obstruction

  13. Structural Capacity

Exceptions to non-controlling criteria should also be identified, justified, and documented, taking into consideration the effect of any deviation from design criteria on safety.  The project files should include this information.

 

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Page last modified on April 1, 2019
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