TraCI/Change Traffic Lights State

Command 0xc2: Change Traffic Lights State

ubyte string ubyte <value_type>
Variable Traffic Lights ID Type of the value New Value

Changes the state of a traffic light. Because it is possible to change different values of a traffic light, the given value may have different types. The following values can be changed, the type of the value to given is also shown in the table.

Overview Changeable Traffic Lights Variables
Variable ValueType Description
state (light/priority tuple) (0x20) string Sets the phase definition to the given. Assumes the given string is a tuple of light definitions from rRgGyYoO, for red, green, yellow, off, where lower case letters mean that the stream has to decelerate
phase index (0x22) integer Sets the phase of the traffic light to the given. The given index must be valid for the current program of the traffic light, this means it must be between 0 and the number of phases known to the current program of the tls - 1.
program (0x23) string Switches the traffic light to the given program. No WAUT algorithm is used, the program is directly instantiated. The index of the traffic light stays the same as before.
phase duration (0x24) integer Sets the remaining duration of the current phase in milliseconds.
complete program definition (0x2c) compound (see below) Inserts a completely new program.


The message contents are as following:

state (light/priority tuple) (0x20)

string
Phase Definition (light/priority tuple)

state (phase/brake/yellow) (0x21)

string string string
Green bitset Brake bitset Yellow bitset


phase index (0x22)

integer
Phase Index

program (0x23)

string
Program ID

phase duration (0x24)

integer
Phase Duration [ms]

complete program definition (0x2c)

byte integer byte string byte integer byte compound byte integer byte integer <phases>
value type compound item number value type string program ID value type integer Type (always 0) value type compound Compound Length (always 0!) value type integer Phase Index value type integer Phase Number Phases

with Phases:

byte integer byte integer byte integer byte string
value type integer Duration [ms] value type integer unused value type integer unused value type string State (light/priority-tuple)


Note:
For more information about what value should be put in each of the fields mentioned above, see Tutorials/TraCI4Traffic_Lights#Further_Notes. Remember that you can check which integer value is associated with particular value type here.
This page was last modified on 9 November 2011, at 12:12.