GCDC forum

Hi Elin,

There are no specific requirements wrt the look-ahead time/distance for speed intent. The use of these messages is entirely optional.

Note also that there is no explicit demand for the VehicleSpeedIntent message. I admit this may be a bit confusing in light of the message summary in Chapter 4: Here is says that the frequency is "On Demand", but we only meant to say that this message is not "Periodic".

Use of the VehicleSpeedIntent message is for exchanging short-term planning information in terms of velocities (positions). For instance, if a platoon leader discovers that he has to wait for a traffic light ahead, he may send out a speed profile to his followers. The followers then:
* Know the speed will change; causing no surprises;
* May take actions in preparation for the speed changes.

As you notice, there are many "may"/"could"/"might"/"optional" annotations in the previous section. To put it simply: we do not enforce the use of speed-intent, but would love to see some use for it.

Best regards,

Jan