在加州住宅区可以，但是business districts不行，这个包括 apartments, multiple dwelli

https://www.dmv.ca.gov/portal/dmv/detail/pubs/hdbk/turns In business districts. Areas with churches, apartments, multiple dwelling houses, clubs, and public buildings (except schools) are also considered to be business districts. Turn only at an intersection, unless a sign prohibits it, or where openings are provided for turns.

所有跟帖： 

• In California, should you fight a ticket for an illegal U turn?（ -soccer88- ♂ (15213 bytes) () 05/17/2016 postreply 10:43:01

• 说老实话，读半天感觉没事别U-turn，麻烦 -soccer88- ♂ (169 bytes) () 05/17/2016 postreply 10:46:50

• 是住宅区，但是在一个小学上学时 -fourwaves- ♂ (62 bytes) () 05/17/2016 postreply 11:40:17

• 你应该仔细读一读citation -soccer88- ♂ (0 bytes) () 05/17/2016 postreply 12:06:11