Updated: Apr 8
Google has introduced a speedometer feature in google maps navigation screen. This feature very useful for the users to stay within the speed limits. The app will give warning if user exceeding the speed limit. Speedometer placed on lower bottom corner of the maps navigation screen.
Google borrowed this feature from Waze app. This feature now available in selected countries (US, Belgium, UK and Brazil) and limited users only.
You can enable this feature in below path in google map app. Only limited users only have this settings. It will available for all users soon.
Settings -> Navigation settings -> Speedometer