The existing interchange of US 30 and US 322 provides both eastbound and westbound on-ramps and off-ramps.
EXISTING CONDITIONS
CONCEPTUAL DESIGN ALTERNATIVES
Under the Conceptual Design phase, two potential alternatives are being evaluation for the US 322 Interchange:
US 322 ALTERNATIVE 1, MAY 2017
- US 30 Mainline is 3 lanes in each direction
- Similar to existing partial Cloverleaf Interchange configuration partial
- Westbound Ramps Intersection is signalized
- US 30 Eastbound Ramps Intersection Alternative 1a
- Signalized along Eastbound Off-ramp approach
- Eastbound Off ramp combines left and right turn lane at signal
- US 30 Eastbound Ramps Intersection Alternative 1b
- Stop control along Eastbound Off-ramp approach
- Eastbound Off ramp has right turn merge lane
US 322 ALTERNATIVE 2, MAY 2017
- US 30 Mainline is 3 lanes in each direction
- Diverging Diamond Interchange (DDI) at US 322
- Eliminates the need for left-turning vehicles traveling onto or off interstate to cross the paths of approaching through vehicles
- Two synced traffic signals for US 322 eastbound and westbound through movements
- Traffic signal for US 30 westbound off-ramp right turn at US 322
ENVIRONMENTAL RESOURCES
The significant environmental features of the section are relatively limited consisting include, potential historic properties, a school, and four streams. There are numerous older buildings found primarily along US 322 that may have historic significance and will require evaluation. The Downingtown Area School District complex is located to the south of US 30 east of the US 322 interchange. Within the complex the Downingtown Middle School and several athletic fields abut US 30. The streams in the section are all small, unnamed tributaries. The two found west of US 322 tributaries of Beaver Creek and the two east of US 322 tributaries of the East Branch of the Brandywine Creek.
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