maneuver
The maneuver for the step, if any.
This is a string that describes the maneuver to be performed at this step, such as "turn-left" or "uturn-right". It may be null if no specific maneuver is associated with this step.
Possible values include:
"straight"
"turn-left"
"turn-right"
"turn-sharp-left"
"turn-sharp-right"
"turn-slight-left"
"turn-slight-right"
"uturn-left"
"uturn-right"