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Washington, DC 20590
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FHWA Home / Safety / Roadway Departure / Nighttime Visibility

Nighttime Visibility

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Implementation Tools – Sign Retroreflectivity

Sign Retroreflectivity Methods Table

Summary of Sign Retroreflectivity Maintenance Methods

A method must be
implemented and in use
by January 2014
EQUIPMENT
NEEDS
INSPECTOR REQMTS TIME DEMANDS
Retro-
reflectometer
Inspection Vehicle Must Know
Sheet Type
Inventory Trained Age At Night Must Stop
At Signs
ASSESSMENT
METHODS
Select Any 1 of These 3Visual Procedures Calibration Signs Photo: Street Signs, Unleveled Pavement, Yield Sign, Predestrain Crossing Sign   Any   (1) Any  
Comparison Panels Image: Partial Warning Sign   Any   (1) Any Only
Marginal Signs
Consistent Parameters Photo: Workers in Car   PU
or
SUV
  (1) 60+  
Measured Retro Photo: Measured Retro device   (1) (2) Any  
Every Signs
MANAGEMENT METHODS Expected Sign Life Line Chart: Green Slant Downward Arrow, Orange Bar at lower line of chart     (1)        
Blanket Replacement Map: Divided by 6 areas     (1)        
Control Signs Image: Control Sign To Check Control Signs   (1) (2)     Only
Marginal Signs

(1) Not required in MUTCD, but might be beneficial
(2) Need training on operation of retroreflectometer
Means "required"

Page last modified on February 1, 2017
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Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000