Enter Only Sign Material:Diamond Grade 10+ If your highways have speed

If your highways have speed limits of 75 mph

This is the most popular construction sign that we sell

Speed Limit 30 is a common speed for residential areas in cities and towns across the country

No maintenance/service required (3yr guarantee)

25 Saves Lives

Enter Only Sign Material:Diamond Grade 10+ If your highways have speedSize: 18x18 We make all our signs from . 080 thick aluminum. Other companies use steel which rusts, plastic which cracks or warps, or a thinner gauge aluminum (. 060 or . 040) which bends or buckles. Material Details We use 3M reflective sheeting and 3M UV resistant inks. 3M offers the following on their sheeting: 3M 3400 Series Engineer Grade Prismatic (EGP): Rated for 5 7 year outdoor lifespan 3M 3930 Series High Intensity Prismatic (HIP):