Plans for the trail include transforming whole lanes of existing traffic in some places into wide, open spaces for bikes and people. (treehugger.com)
The drawback is that they aren't as easily updated as a smartphone, which always provides current data and can also deliver existing traffic information. (sema.org)
In addition, merging into traffic from another street, in a parking lot or onto a highway requires giving existing traffic the right of way. (lorenzoandlorenzo.com)