Yaris Hybrid 68 Warning Sounds

[YarisUser]

I recently acquired a 68 plate Yaris Hybrid, and I'm puzzled by some of the 'warning' sounds it makes. I'm used to it making a series of insistent beeps if I come up behind something (or just pull into a parking space), but I've been baffled by a rather less insistent sounding warning of, I don't know what ...

When driving, the car will regularly give out two gentle 'boop boop' sounds, but there is nothing on the dashboard or central display to give any hint about what it's trying to tell me. I ought to have worked it out by now (and can't find anything in the manual, either), but it has me stumped.

Anyone?

[Parts-King]

The beeps going into a parking space are probably parking sensors

The double beep is probably a speed camera warning, it double beeps a few hundred yards before a static camera