A long time ago, Kingshighway went straight north, and then doglegged right in front of Barnes Hospital, before turning right in front of Forest Park (did you know technically there are a couple of acres of Forest Park east of the current curved alignment to this day?). When Highway 40 was built, that giant cloverleaf was installed, crashing through your parkland, and this section was rechristened Euclid Avenue, as it is named further north.