Erdman Anthony (as Crossroads) provided engineering and surveying services as a
prime consultant for FDOT, District 4, for the milling and resurfacing of SR 710
from Speedway Road to west of Commerce Drive in rural western Palm Beach County.
The SR 710 project was a 2.5-mile 3R project involving milling and resurfacing
to improve poor pavement conditions and add paved shoulders.
safety improvement involved increasing the superelevation of the reverse curves
due to the high-speed nature of the facility. A private railroad spur crossed
the roadway near the beginning of the first curve, so the profile grade line was
designed carefully to result in minimal impacts to the elevations at the
railroad crossing. After due consideration, the superelevation improvement was
achieved with overbuild rather than reconstruction, thus speeding the
construction process and reducing the maintenance-of-traffic effort.
Storm water storage also was needed for water quality purposes due to
the addition of paved shoulders. The right-of-way was wide; however, the outer
limits of the right-of-way area were classified as wetlands. We were successful
in achieving the necessary storage volume within the median swale. Thanks to the
superelevated curves, sufficient impervious surface drained towards the median
to exceed the additional impervious area. Therefore, by raising the median
inlets slightly, the water quality volume was achieved without purchasing land,
constructing expensive exfiltration trenches, or impacting the wetlands.
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