So I figured it out, but I'm not sure how to map it. This road is indeed named Valley Road. The misnamed bit is the northeastern part of the Y-shaped boulevards (that split Spieker Road), which should be a continuation of Pleasant Valley Drive. So then the bit where they meet should be, theoretically, both at the same time. There are rules for e.g. a state highway and a county road designations overlapping, but I'm not aware of anything for name=*  overlapping on a neighborhood street.