Maybe a twist to this (this is common where I ride - situation is a 25mph road crossing a 45mph arterial) is that its hot outside windows are up AC and stereo blasting, driver is going 55mph before left turn and slow only enough to make the turn, hence also cutting it with a wide radius as a tight turn would require slowing even more. Cutting corners like this very common (when lane not occupied by a notable vehicle that only takes a glance to see)

Al