As a safety measure you may want to consider a vehicle loop detector in the ground to detect when a vehicle is under the gate so it doesn't come down and cause damage. -- Sincerely, James Burkart *Filmmaker & Documentarian* *Burkart Studios* 415.738.2071 | Phone 925.226.4910 | Fax *Web:* burkartstudios.com *Facebook:* facebook.com/burkartstudios --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .