Single - point urban interchange ( SPUI ) -- A SPUI interchange is nearly similar with a typical diamond interchange .
It allows traffic from two opposite directions to turn right at the same time ; however , it does not allow traffic to go straight .
Single - point urban interchange ( SPUI ) -- A SPUI interchange is nearly similar with a typical diamond interchange but it allows traffic from two opposite directions to turn right at the same time ; however , it does not allow traffic to go straight .