The same feature was first witnessed in the Waze app that was acquired by Google in 2013. Features, like telling about incidents and crashes, police checkpoints and , have already been introduced in the app. Google also lets users customize their navigation icon.
Not all have access to this feature and so far, Australia, Belgium, Canada, Brazil, Czech Republic, Finland, Germany, India, Netherlands, Poland, Portugal, Sweden, Taiwan, the UK, and the US have been reported to have this feature available.
Android Auto does not have this feature yet, however it is available on the Auto app.
Google while that the purpose of it is to inform only. But as GPS is not always reliable, the speedometer can also be uncertain at times. Therefore, it is better to rely on what is actually informed by the local traffic police.