: Operations

The current performance monitoring intervals for active LTPP test sections, excluding test sections in the SPS-10 Experiment – Warm Mix Asphalt Overlay of Asphalt Pavement Study, are:

Performance Measurement	Long-Term
Longitudinal Profile/Texture:	1-2 Years
Manual Distress Survey:	2-3 Years
Deflection:	4-5 Years
Materials Testing & Sampling:	As Required

The historical performance monitoring intervals for LTPP test sections included in the SPS-10 Experiment – Warm Mix Asphalt Overlay of Asphalt Pavement Study, including measurements prior to construction, short-term, and long-term performance monitoring, are:

Performance Measurement	Pre-Construction	Short-Term	Long-Term
Longitudinal Profile/Texture:	6 Months	30 Days, 3-6, 11-13, & 17-19 Months	1-2 Years
Manual Distress Survey:	6 Months	30 Days, 3-6, 11-13, & 17-19 Months	1-2 Years
Deflection:	6 Months	30 Days, 3-6, 11-13, & 17-19 Months	3-5 Years
Materials Testing & Sampling:	-	30 Days, 3-6, 11-13, & 17-19 Months	-

Please see the DCSC Monitoring Schedule for a three-month pavement performance monitoring plan and schedule for active LTPP test sections.

The guidelines on frequency of LTPP pavement monitoring measurements have varied over time. LTPP does not attempt to explain missing measurements that were not performed in accordance with guidelines.The LTPP database contains the results of measurements performed. Measurement guidelines are contained in LTPP Directives.