My FCW has triggered several times. Keep in mind that the system evaluates your vehicle's closing rate to an object (stationary or moving) versus your vehicle speed to determine if the driver is not sufficiently braking. My GUESS is that the FCW system doesn't judge the turn/turning of the steering wheels and certainly doesn't judge the driver's attentiveness and close quarters skill of the driver.
Three ways to test:
> (a) prepare yourself for the vehicle warning and braking. (b) execute a "city swing around" by coming up on someone making a right hand turn (either stopped or moving very slowly) and swerve around them at the last moment just missing their vehicle (c) change your shorts if necessary.
> Go to an empty parking lot. Use a concrete based light pole, stage a car, or set up a "bumper" of empty garbage cans. Execute the "city swing around". Change shorts if necessary.
> have a city driver test your FCW.
My close quarters skills were developed through years of NY City driving and I try to keep the skills current through regular practice. The FCW - even on the near setting - is annoying to an experienced city driver.
Be careful - I'm not responsible for your driving skill nor your reaction to the warning/braking!!!