Reflective Signs Are Hard to IgnoreEasy to spot by day, and reflective at night, use these Bidirectional No Parking Any Time signs to protect your property and make sure no one parks in an unauthorized space.3M Engineer Grade [EG] Reflective3M Engineer Grade reflective signs are the most common material found on our public roads. 3M Engineer Grade signs have 7 year outdoor warranty.USAs Oldest Sign ManufacturerYou can now buy the exact same signs that you see on public roads. Our South Dakota factory in the oldest manufacturer of metal signs in the USA. Family owned since 1918, we take enormous pride in our signs and have been an integral part of the progression of our national parking sign designs and specifications over the years.Industry Leading Durability3M Engineer Grade signs have a 7 year outdoor warranty, but most signs last much longer. Our signs are laminated for enhanced performance. You can clean off graffiti and your graphics are protected. Unlike many other signs, our Bidirectional No Parking Any Time signs use industry-leading 3M inks and not off-brand or other low-durability ink jet pigments that fade in a year or two.