Colorful Language

Between graduations, family reunions and “I gotta get out of town!” trips, I’ve been putting a lot of miles on the family truckster as of late.

Driving interstates, county roads, city streets and gravel paths, I’ve been advised, guided and warned by signs. Lots of signs. Signs of every color and size, it seems. I got curious, so I checked it out and found out there’s a special language to traffic signs – and you are probably fluent without even thinking about it.

Traffic signs are consistent throughout the U.S. because of a document called the Manual on Uniform Traffic Control Devices. It’s a required reference for traffic engineers, but not something you’d want to take for a read on the beach. The guide is managed by the Federal Highway Administration and the rules within are followed by all public and private roads open to public traffic.

So when I head to visit my bestie in Kentucky, I am assured that the stop signs there will be octagonal with white letters on a red background, just like they are here.

Color is one part of traffic sign language. Here is a list of the official colors and the meaning behind each:

Red – Stop, yield and forbidden actions such as No Parking.

Orange – Temporary traffic control zones and detours. You often see them at work zones.

Yellow – Warning. Think curves, divided highway signs and such.

Yellow-Green – This is a newer color used on all new school-related signs, such as school zone and school crosswalk signs. It can be used for bicycle and pedestrian warning signs, too.

Distance Sign

Green – Informational signs that give directions, distances and place information.

Blue – Services. These signs announce the presence of rest areas, food, hospitals, lodging and the like.

Purple – This color is used on signs intended to help guide drivers who have registered electronic toll collection accounts, such as EZPass. You’ll see these in states with toll roads.

Pink – Incident. This is a newer color in a day-glo hue. It indicates a crash or other emergency condition exists. You’ll likely see this on temporary, fabric signs deployed by emergency services like police or fire crews.

Brown – Features of interest. Brown signs direct motorists to parks, historic sites and similar sites.



Library Sign



Other parts of the MUTCD dictate sign shapes, the type font and case of letters used on signs and other traffic markings. It’s a valuable reference - kind of a grammar handbook and dictionary rolled into one…but I think I’ll grab a nice thriller for my weekend at the lake.

Missouri Miles

In part one of Missouri Miles for July, we show you how MoDOT is saving money by cleaning signs instead of replacing them. Then we take you inside a big rig for the Missouri Truck Driving Championship in Springfield, Missouri. In part two, learn everything you need to know about driving around a roundabout. We take you on a bike ride in Jefferson City as a fundraiser for the MoDOT Memorial Fund, as well as remind you that "The Heat is On" this summer!
All that and more in this month's edition of Misouri Miles.

Saving Signs

Teens and others may think it's a hoot to vandalize highway signs with spray paint and paintballs.

Not us.

We think it's ripping off taxpayers who have to foot the bill for a new sign, and that's money that could go to road repairs.

So we're fighting back. We're the first transportation department in the nation to test various paint removers on highway signs so they can be cleaned rather than replaced. And we're pleased to report our efforts have met with success.

While there are many paint removal products on the market, the trick was finding one that wouldn't render a highway sign "dead," meaning it wouldn't strip away the materials that make the sign reflective at night or leave a shadow where the paint hit. Our crews recently put the products to work on several signs near LaMonte, Mo., with positive results, and we'll be sharing our findings with other states.

Cleaning a sign rather than replacing it saves as much as $1,000 depending on the sign's size. That might not take away the thrill some folks get from hearing the splat of a paintball hitting a highway sign, but it sure makes us feel better.