In General:
- A green arrow means Allowed
- A yellow arrow with a clock means Partially Restricted (scheduled or vehicle-type based)
- A red arrow with the circle-slash icon means Restricted
- Clicking an arrow toggles between Allowed and Restricted (or, between Partially and Fully Restricted).
NOTE: The slashed-circle icon for Restricted and clock icon for Partial turn restrictions are put in place to allow editors with various forms of color blindness differentiate between the three different types of turn arrows.