![]() Where y = condition attribute being predicted, x = age (years), and a, b, c, and d = regression coefficients. The condition remains nearly constant for a number of years, then rapidly deteriorates, and then remains nearly constant again. However, the rate of deterioration is based directly on time rather than a logarithm. Like an exponential-type graph, the pavement condition remains nearly constant for a large number of years, and then rapidly deteriorates. This type of model is a special form of the exponential type. ![]() This type allows you to specify points in time where the deterioration rate "jumps" to a new value, where it again remains constant until the next discontinuity. You specify up to six coordinates, and the system draws a straight line between each coordinate. The condition deteriorates steadily with the greatest rate of deterioration occurring in the early years. The condition remains nearly constant for a number of years, and then rapidly deteriorates. The rate of deterioration of the pavement condition is the same from year to year.
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