One year ago after seeing a horrible bridge collision I decided to
investigate low clearance avoidance tools. After a great deal of
searching, by far the most cost effective solution was to
download a low clearance POI database for my GPS.
There were a few free ones out there to download but they were
very limited in size (around 300 - 500) which isn't much use so I
figured I would risk 20 bucks and get a professionally made one
which had over 3000 low clearance alerts.
I've been so impressed with it that I made several positive
comments on quite a few forums in the hope that other drivers
will follow suit and avoid these potentially fatal accidents.
If you're interested (and you really should be) you can get it from
. I use a Garmin but you can also
install it on MS Streets & Trips, Delorme Street Atlas,
Google Earth, TomTom, and Navman.