Not only are these ideas true for new interchanges, but they also hold when existing cloverleaf interchanges are upgraded. In Norfolk, Virginia, the interchange between US 13 and US 58 was originally a cloverleaf—it has since been converted to a SPUI. Also, many cloverleaf interchanges on California freeways, such as U.S. 101, are being converted to parclos. In Hampton, Virginia, a cloverleaf interchange between Interstate 64 and Mercury Boulevard has been partially unwound into a partial stack interchange. During 2008 and 2009, four cloverleaf interchanges along I-64/US 40 in St. Louis, Missouri, were replaced with SPUIs as part of a major highway-renovation project to upgrade the highway to Interstate standards.