Traffic Light

Description

Provides current status of the Traffic Light and also the distance to the next traffic light per the May's Planner

traffic_light_t

Field	datatype	Description
utime	string	Local machine time when this list was generated
distance	int32	distance to the next traffic light that we plan to wait for. Use -1 if no traffic light is currently relevant, for example if we have another intersection before this light
signal_type	SignalType	Configuration of traffic light
status_straight_turn	Status	Estimate of the light status
status_right_turn	Status	Estimate of the light status
status_left_turn	Status	Estimate of the light status

SignalType

Field	Description
SIGNAL_TYPE_UNKNOWN	Default value for traffic light. This is the most commonly found vertical 3 segment traffic light with red on top
SIGNAL_TYPE_DEFAULT_STANDARD	Default value for traffic light. This is the most commonly found vertical 3 segment traffic light with red on top
SIGNAL_TYPE_5_SEGMENT	5 segment light with straight and left directions
SIGNAL_TYPE_NONE	This is empty signal. Placeholder for traffic lights
SIGNAL_TYPE_VALID_UNKNOWN	This is unknown signal . Placeholder for traffic lights

Status

Field	Possible Value
STATUS_UNKNOWN	0
STATUS_RED_FLASH	0x11
STATUS_RED_SOLID	0x21
STATUS_YELLOW_FLASH	0x12
STATUS_YELLOW_SOLID	0x22
STATUS_GREEN_FLASH	0x14
STATUS_GREEN_SOLID	0x24

Topic/channel string

For Realtime API

Pass the comma seperated topic name as a query param

/.vehicle.{vehiclename}.TRAFFIC_LIGHT

JSON Output

Order of fields might differ

{
    "distance": 1.0,
    "estimate": {
        "signalType": "SIGNAL_TYPE_DEFAULT_STANDARD",
        "statusLeftTurn": "STATUS_UNKNOWN",
        "statusRightTurn": "STATUS_UNKNOWN",
        "statusStraightTurn": "STATUS_GREEN_SOLID",
        "utime": "1718744308162650"
    },
    "topic": "TRAFFIC_LIGHT",
    "utime": "1718744308241909",
    "vehicle": "vehiclename"
}