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I have been trying out various low clearance avoidance tools after witnessing a horrible accident and having a close call myself. Obviously I look out for the signs ahead, but not all bridges are posted and it's no good for planning a route anyway. So what are the options? Rand McNally Motor Carrier Road Atlas Pros - Much more than a low clearance list, with an abundance of useful information. Cons - Limited to just over 1000 low clearances. Can't use while driving. Costs around $50. Available at: http://www.amazon.com/McNally-Deluxe-Motor...y/dp/0528942123 POI-Factory.com low clearance POI database for GPS Pros - Free to download. Accurate. Ready to install. Cons - Limited data, not much more than 300 entries. Available at: http://www.poi-factory.com/node/1154 DiscoveryOwners.com low clearance POI database for GPS Pros - Free to download. Accurate. Cons - Limited data, approximately 400 entries. Many duplicates across several databases. Only available in text format. Available at: http://www.discoveryowners.com/cginfolinks.htm LowClearances.com low clearance POI database for GPS Pros - Huge database, up to 10 times larger than the others available. Accurate. Regularly updated. Ready to install. Cons - Costs $20 for annual subscription. Available at: http://www.lowclearances.com There are also a few fully integrated GPS systems available, but these are very expensive and I cannot vouch for their accuracy or the number of low clearances in their databases. Hope this is of use.

Thanks for your helpful advice. I have decided to try a POI database that has been recommended to me on several forums. You can download it at http://www.lowclearances.com It looks really good. Thanks again.

I have recently had a few close calls with low bridges that could easily have resulted in a bad accident. Does anyone know of a good GPS system or add-on for my Garmin that would give a low bridge warning? Something like a speed camera POI list could work, but I can't seem to find anything. Many thanks.