According to forecasts by the Delaware Valley Regional Planning Commission (DVRPC), having built the Lafayette Street interchange reduced traffic at the Norristown interchange by approximately 20% and the Valley Forge interchange by about 4%. Reducing this traffic creates capacity for the office and commercial growth already expected to take place in Plymouth Meeting and King of Prussia over the next 10 to 15 years. Traffic has been reduced on local roads such as Ridge Pike, Germantown Pike, U.S. 202, Belvoir Road, and Sandy Hill Road.
The Montgomery County Planning Commission completed a
Turnpike Corridor Reinvestment Study in 2015, which showed a new interchange at Lafayette Street (without any additional improvements or zoning changes) would bring an additional 5,900 to 8,000 trips to the Turnpike per day, yielding an estimated additional $66 million to $90 million in revenue from 2020 to 2040.