The new parkway would lower traffic on NY 9A through Elmsford while also connecting to the Westchester County Medical Center, a local jail, and Westchester Community College. Economic improvements of the parkway extension would include nearly 6,000 new jobs and over $2 million (1978 USD) in tax rebates. The fourth and final section of the Sprain Brook Parkway was opened on October 28, 1980 at the cost of $25 million (1980 USD). The last section, deemed a long missing link, finished the parkway to its full length between the Bronx River Parkway and the traffic circle in Hawthorne. This new piece of the parkway was built with 70% of the required funds provided by the federal government, and was designed to redistribute traffic along different parkways, with NYSDOT estimating about 44,000 cars daily using the completed roadway.