Fort Mill Just Opened South Carolina’s First Double-Crossover Interchange


South Carolina just opened its very first “diverging diamond” lane exchange – a new type of exit and onramp exchange that implements a ‘double-crossover’ traffic pattern designed to decrease congestion.

The new exchange just opened at the Gold Hill Rd. exit off highway 77 in Fort Mill – the second busiest interchange in the region, with over 25k daily drivers.

Construction on the project first started 2019, and has now racked up a total cost $14.5 million.

Here’s a brief explanation of how the new exchange works:

Here’s a more exhaustive overview of how it works:

The new interchange has already been built in several other states, including North Carolina in the Raleigh area.

Do you think this was a good investment?