rear traffic alert when moving forward?

[Blackgolf]

occasionally I get the rear traffic alert when I start to move forward slowly from stop. is it supposed to be active only when I put in reverse?

 

[in2insight]

My understanding is that it is active all the time, which helps monitor activity behind the car.
The manual may be a wiser option for an answer.

 

[JoulesThief]

I've had Ford hybrids pull up behind me while driving in heavy traffic and the sensors in their front bumper manage to set off the sensors on my rear bumper. Probably they are both on the the same wave length or frequency, causing this situation.