Turn Restrictions
Turn Restrictions (TR's) are described on the Junction Arrows page.
Restricted Turn 
Indicated with a red arrow. Prohibits routing from one segment to another through that junction.
Enabled Turn 
Indicated with a green arrow. Permits routing from one segment to another through that junction.
Turn Instruction Overrides
Turn Instruction Overrides (TIO) is a feature in the WME which allows editors to manually set a turn arrow to give a non-default text and verbal instruction to the driver making that turn through a junction.
Note: A micro-dogleg (mDL), is a technique used for altering the angle Waze sees at a junction, which affects turn instructions. This technique is replaced by the TIO.