said by koira:my garmin gps does that, must be common feature to their code
Garmin and TomTom do lane guidance but they are definitely separate companies. My guess is this is, by extension, a way for Apple to get street view.
Edit, apparently other people noticed them a couple years ago and TomTom says:
"The vans are taking 360° shots around themselves so we can confirm street/road signs, road markings (such as lanes), and the geometry of the roads. This is used for internal purposes only and is not accessible to the public."