Induction Loop Value Retrieval

## Command 0xa0: Get Induction Loop Variable

ubyte | string
--- | ---
Variable | Induction Loop ID

Asks for the value of a certain variable of the named induction loop (e1 detector). The value returned is the state of the asked variable/value within the last simulation step. Please note that for asking values from your detectors you have to define them within an additional-file and load them at the start of the simulation. The `period` and `file` attributes do not matter for TraCI.

The following variable values can be retrieved, the type of the return value is also shown in the table.

Overview Retrievable Induction Loop Variables

Variable | ValueType | Description | Python Method
--- | --- | --- | ---
id list (0x00) | stringList | Returns a list of ids of all induction loops within the scenario (the given Induction Loop ID is ignored) | getIDList
position (0x42) | double | Returns the position of the induction loop at it's lane, counted from the lane's begin, in meters. | getPosition
lane ID (0x51) | string | Returns the ID of the lane the induction loop is placed at. | getLaneID
count (0x01) | int | Returns the number of induction loops within the scenario (the given Induction Loop ID is ignored) | getIDCount
last step vehicle number (0x10) | int | Returns the number of vehicles that were on the named induction loop within the last simulation step [#]; Note:This value corresponds to the nVehEntered measure of induction loops. | getLastStepVehicleNumber
last step mean speed (0x11) | double | Returns the mean speed of vehicles that were on the named induction loop within the last simulation step [m/s] | getLastStepMeanSpeed
last step vehicle ids (0x12) | stringList | Returns the list of ids of vehicles that were on the named induction loop in the last simulation step | getLastStepVehicleIDs
last step occupancy (0x13) | double | Returns the percentage of time the detector was occupied by a vehicle [%] | getLastStepOccupancy
last step mean vehicle length (0x15) | double | The mean length of vehicles which were on the detector in the last step [m] | getLastStepMeanLength
last step's time since last detection (0x16) | double | The time since last detection [s] | getTimeSinceDetection
last step's vehicle data (0x17) | complex (see below) | A complex structure containing several information about vehicles which passed the detector | getVehicleData

## Response 0xb0: Induction Loop Variable

ubyte | string | ubyte | <return_type>
--- | --- | --- | ---
Variable | Induction Loop ID | Return type of the variable | <VARIABLE_VALUE>

The respond to a "Command Get Induction Loop Variable".

### Response to "last step's vehicle data" (0x17)

The return type is "complex", the following fields are:

ubyte | int | <INFORMATION_PACKET> | ... | <INFORMATION_PACKET>
--- | --- | --- | --- | ---
"int" | number of information packets | <INFORMATION_PACKET> | ... | <INFORMATION_PACKET>

Where each information packet looks like:

ubyte | string | ubyte | double | ubyte | double | ubyte | double | ubyte | string
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
"string" | Vehicle ID | "double" | Vehicle Length | "double" | Entry Time [s] | "double" | Leave Time [s] | "string" | Vehicle Type ID

## Notes

- You can find some further description on induction loops

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