Cortana ( US version ) has been updated again and adds travel preferences to “Getting around”. This means you can now chose between “Driving” and “Public transit” as the means of travel in the settings. Apart from means of travel, there are more options provided to disable and enable notifications as can be seen in the screenshots.
If you are using Cortana US, then you can go to Interests and check the “Daily routine” interest, under which you can see the Getting around option.
Thanks Vibho for the heads-up and screenshots!!
Read more about Cortana on our Windows Phone 8.1 dedicated page.