a. Software (overlay).
b. Software (network and project level).
Figure 1. Breakdown of software used.
Generally, FWDs are being used by state DOTs
Table 1. Nondestructive testing software and
analytical tools used by state DOTs.
more for overlay design than for other purposes.
However, DARWIN (and AASHTO), MODULUS,
Evaluation/
Overlay
and ELMOD are the most commonly used meth-
network
design
ods for evaluation. Again, no individual in-house
program is used across the board; nevertheless, a
DARWIN
X
X
AASHTO
X
X
large percentage of states use their own software.
MODULUS
X
X
EVERCALC
X
X
Miles tested
ELMOD
X
X
Figures 2a and 2b show the distribution of lane-
EVERPAVE
X
X
miles tested per state both for overlay design and
WESDEF
X
X
PADAL
X
X
at the network level, respectively. With a few ex-
ILLIBACK
X
X
ceptions, most states test fewer than 700 lane-
ELCON
X
X
miles per year for overlay design. Figure 2b shows
PEDMOD
X
X
that the vast majority of states test fewer than
DAMA
X
X
1000 lane-miles per year at the network level. Note
MICHBACK
X
MICHPAVE
X
that these histograms indicate miles per state, not
Other in-house programs
X
X
miles per piece of DOT equipment; thus, Figure
2
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