Pavement - Remaining Service Life

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Pavement Remaining Service Life

Performance analysis

2021

Remaining Service Life increases

The Remaining Service Life of state-owned pavement gained 0.4 percentage points in 2021, with a value of 47.5%, compared to of 47.1% in 2020. The target value is between 45% to 55% and is expected to remain within this range into the future.

RSL is a measure of average remaining pavement life summed for each section across the roadway network. It is calculated by first estimating the number of years remaining before the condition of a pavement section is expected to become unacceptable (poor or very poor) and then dividing by the pavement section's total expected lifetime. This number is then averaged over all of the pavement sections in the network to yield the statewide RSL.

2020

Remaining Service Life declines in 2020

The Remaining Service Life of state-owned pavement dropped 0.9 percentage points in 2020, with a value of 47.1%, compared to of 48.0% in 2019.

RSL is a measure of average remaining pavement life summed for each section across the roadway network. It is calculated by first estimating the number of years remaining before the condition of a pavement section is expected to become unacceptable (poor or very poor) and then dividing by the pavement section's total expected lifetime. This number is then averaged over all of the pavement sections in the network to yield the statewide RSL. The target value is between 45% to 55% and should remain within this range into the future.

2019

Remaining Service Life improves in 2019

Remaining Service Life improves The Remaining Service Life of state-owned pavement increased between 2018 and 2019, going from 46.9% to 48.0%. The RSL remained within WSDOT's target range of 45% to 55%, as it did for all of the five-year period 2015-2019.

RSL indicates how much of its original life span an average section of WSDOT-owned pavement has left before it will need rehabilitation work. In 2019, an average section of WSDOT-owned pavement had 48.0% of its life span—or 7.8 years— remaining before it was expected to need rehabilitation.

The RSL for each section of pavement is calculated by first estimating the number of years remaining before the condition of that section is expected to become unacceptable (poor or very poor), and then dividing by that pavement section's total expected life span. This number is calculated separately for each section of pavement in WSDOT's network, and then averaged to yield the statewide RSL.

2018

Remaining Service Life declines in 2018

The Remaining Service Life of state-owned pavement decreased between 2017 and 2018, going from 47.4% to 46.9%. The RSL remained within WSDOT's target range of 45% to 55%.

RSL indicates how much of its original life span an average section of WSDOT-owned pavement has left before it will need rehabilitation work. In 2018, an average section of WSDOT-owned pavement had about 46.9% of its life span left before it was expected to need rehabilitation.

The RSL for each section of pavement is calculated by first estimating the number of years remaining before the condition of that section is expected to become unacceptable (poor or very poor), and then dividing by that pavement section's total expected life span. This number is calculated separately for each section of pavement in WSDOT's network, and then averaged to yield the statewide RSL.

2017

Remaining Service Life drops in 2017

The Remaining Service Life of state-owned pavement decreased between 2016 and 2017, going from 48.6% to 47.4% The RSL remained within WSDOT's target range of 45% to 55%.

Remaining Service Life is a measure of the average remaining pavement life across the roadway network. It is calculated by first estimating the number of years remaining before the condition of a pavement section is expected to become unacceptable (poor or very poor), and then dividing by the pavement section's total expected lifetime. This number is then averaged over all of the pavement sections in the network to yield the statewide RSL.

RSL is a much less volatile measure than the ASR, which reflects only changes made in a given year. All else being equal, in a year in which the ASR is equal to 1.0, the RSL percentage would be the same as in the previous year.

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