The fact that some Sat Nav companies like Tom Tom have so many devices in use, they are able to report traffic in real-time.[1] It wouldn't surprise me if simil

The fact that some Sat Nav companies like Tom Tom have so many devices in use, they are able to report traffic in real-time.[1] It wouldn't surprise me if similar averages over a longer period are used to identify speed limits (e.g. What is the mode speed rounded to a multiple of 10, when speeds do not appear constrained by traffic). [1] https://www.tomtom.com/en_gb/licensing/products/traffic/real-time-traffic/hd-traffic/ https://www.tomtom.com/en_gb/licensing/products/traffic/real...