Yes you read it right. Gmaps calculate the ETA (estimated time of arrival) based on traffic and avg speed in that area however it lacked understanding 2 wheeler rider's skills which is why the need.
The speed and traffic handling is different when travelling on a two wheeler instead of a four. Google now has added a two wheeler option when you look for directions. The feature is currently available only in Android beta and will soon be rolled out for regular users.
Google Maps previously displayed only 4 types - driving, travelling thru public transport (bus/train) and walking. But with new feature rolling it shows new category - bike (two wheeler). As the name suggests, this feature will show the fastest direction or route to the Two-wheeler riders.
Two-Wheeler mode is currently available on latest version of Google Maps (v9.67.1) for Android.
There are some roads which are not wide enough for 4 wheelers however the two wheelers can easily swipe through. It is likely that the same will put to good use by GMaps now.