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From page 27... ...
Methods and strategies can be modified to improve operations and to better manage resources. ViSual niGhttime inSPection • FHWA intends for agencies to use one or more of the sign inspection procedures documented in Maintaining Traffic Sign Retroreflectivity (FHWA-SA-07-020)
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From page 28... ...
The regional data could then be used to extend service life for signs in the blanket replacement or expected sign life methods.
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