Final Report - VHB.com

4.7.5 Option 3A
Option 3A (Figure 4-8) is similar to Option 3 except for the treatment of the
interchange-ramp intersections with Main Street. Option 3 incorporates new signals
at each ramp intersection, whereas Option 3A integrates roundabouts at both
intersections. Option 3A replaces the existing signalized Main Street/Coastal
Connector intersection with a grade-separated interchange. The proposed design
raises the grade and widens the Coastal Connector to four lanes, including bicycle–
roadway-shoulder lanes that overpass a widened and reconstructed Main Street. The
four lanes and bicycle–roadway shoulder lane-widening extends easterly through the
reconstructed at-grade signalized intersection with Community Way/Village Drive
to the existing four-lane section at the signalized connector road to the State Route 24
(Middlesex Road) intersection. New interchange ramps provide free-flow access
from the Coastal Connector to single-lane roundabout intersections with Main Street
north and south of the proposed overpass bridge. The grade raise along the Coastal
Connector is approximately 0.5 mile in length. It begins at the intersection of Union
Park and Horton Place with the Coastal Connector and ends 0.2 mile west of the
existing Community Way/Village Drive intersection. The Union Park/Horton Place
intersection is reconfigured by extending the existing raised median westerly and
allowing only right turns onto and off of Lewiston Road.
The new Main Street interchange is configured as an urban half-cloverleaf-type with
both the eastbound and westbound ramps located east of Main Street. This proposed
interchange configuration takes advantage of the topography, existing cultural
resources, and existing roadway infrastructure, including Monument Place and
access to Mount Ararat High School. The ramps provide free-flow access to and from
the Coastal Connector before transitioning to a three-lane roadway section that
includes two travel lanes and a center left-turn lane to control access to abutting
properties before intersecting with new roundabouts at Main Street.
In Option 3A, Main Street is widened and reconstructed for approximately 0.6 mile
beginning at approximately 0.1 mile north of Pleasant Street and ending in the
vicinity of Forest Drive to the north. The widening includes one travel lane in each
direction and a raised-median island that transitions to a left-turn lane (if required) at
intersections. Sidewalks are constructed on both sides of Main Street and along the
north side of the westbound ramps into the Mount Ararat High School complex. The
eastbound ramps intersect Main Street at a new roundabout opposite Monument
Place. The westbound ramps intersect Main Street at a roundabout at the existing
entrance to Mount Ararat High School. The high school access shifts to the east and
connects to the westbound ramps. A new connector roadway intersects the new
roundabout opposite the westbound ramps. The connector extends from Main Street
westerly and southerly approximately 0.3 mile, connecting opposite Mallet Drive at
the current signalized intersection with Lewiston Road. In Figure 4-8, a future
multiuse trail is shown adjacent to the Coastal Connector and the proposed
interchange ramps to provide continuity along the Coastal Connector corridor and
connectivity to adjacent connecting roadways.
Summary of Options 100