For my undergrad GIS project I am looking at whether left turns only (on UK roads... ie. not crossing traffic) could be more efficient for a delivery driver in a 2.2km radius.
I know it probably won't be, but I'm doing it for the sake of it, to show that I can use the software to the assessors etc.
Using OS Open Roads as a network and ArcMap's network analyst extension, is there a straightforward way to assign different costs to left and right turns? (i.e. make right hand turns take as long as four left hand turns or similar).