TxDOT uses three methods for determining the end-of-service life of pavement markings:

Explanations of each follow.

Subjective Daytime Visual Evaluation.

Subjective daytime visual evaluation can be performed according to Test Method under the section titled “Characteristics for Replacement Scheduling” using the daytime inspection method. This method involves determining the maximum daytime visibility distance of existing markings when viewed from a vehicle. Daytime visual inspection of pavement markings should occur at least once per year. Refer to the TxDOT

Manual of Testing Procedures

for detailed information.

Subjective Nighttime Visual Evaluation.

Subjective nighttime visual evaluation can be performed according to Test Method under the section titled “Characteristics for Replacement Scheduling” using the nighttime inspection method. This method involves determining the maximum nighttime visibility distance of existing markings when viewed from a vehicle with the headlamps on. Nighttime visual inspection of pavement markings should occur at least once per year. Refer to the TxDOT

Manual of Testing Procedures

for detailed information.

Retroreflectivity Evaluation.

Retroreflectivity evaluation can be performed by taking a series of retroreflectivity measurements of the markings and comparing them to guidelines for minimum in-service retroreflectivity.