From Wazeopedia
=====Where to mark toll segments=====
# Mark a road segment with a toll free restriction only if the segment has a toll booth, transponder reader, or other tolling device
# Marking a segment as toll free makes the segment act as a toll for all other users (even though toll)
# Do not mark the toll attribute; which would prohibit adding a toll free restriction
# Non-toll collecting segments should not have the the toll free restriction