Single Route Instruction object.
- "F" : Straight forward
 - "B" : U-turn
 - "L" : turn left
 - "R" : turn right
 - "BL" : turn left strongly
 - "BR" : turn right strongly
 - "FL" : turn lightly to the left
 - "FR" : turn lightly to the right
 - "round_about_entry" : round about entry
 - "round_about_exit" : round about exit
 
Properties:
| Name | Type | Description | 
|---|---|---|
| code | String | Instruction code :  | 
        
| instruction | String | Instruction text : translated code + street name  | 
        
| geometry | Object | Geometry (expressed in GeoJSON) of the street.  | 
        
| distance | Float | Length of the instruction. Expressed in km or m, depending on distanceUnit parameter.  | 
        
| duration | Float | Instruction duration in seconds.  | 
        
