I hire cars fairly often, and some of the newer ones just make random ding noises with no visual indication, and I can’t work out why. I think it may sometimes

I hire cars fairly often, and some of the newer ones just make random ding noises with no visual indication, and I can’t work out why. I think it may sometimes be a blind spot or proximity warning. That being said, only some cars do it so I’m guessing it’s poor manufacturer implementations mainly.