We are excited to announce the acquisition of Vision Engineering & Planning, a transportation planning and engineering DBE firm with offices in Columbia, MD and Atlanta, GA.
By: Jeremy Greer, P.E. Traffic signals are part of daily life for most U.S. citizens. Traffic signals are commonly seen at roadway intersections and primarily function to assign the right-of-way to the various traffic movements. A traffic signal uses three colors, directional arrows, and circular indications to convey certain messages to drivers. When signals work […]
By: Mark Randall, PE (TN), CPESC You may know that mile markers or mile posts tell drivers their location along an interstate or highway, but did you know how those markers are established or the other functions that they serve? Mile markers are used to indicate the distance traveled within a state as well as […]
By: Richard Holt, P.E. Have you ever wondered what that terrible noise and vibration is when you slightly veer over the center or edge line of the roadway? Those noisy bumps are referred to as rumble strips or rumble stripes. They are formed when a strip of asphalt has been milled (cut) or rolled with […]
By: Diane Hammonds, P.E. / Branch Manager / LA office Some of us know about the birds called loons, but as traffic engineers we have loons too! A loon is also referred to as a “Michigan Left” because of their wide use there. It is pavement constructed outside of the travel lane to allow for vehicles […]
By: Alicia Bailey, P.E. Did you know Sain Associates has many on-call contracts with ALDOT? There are many benefits of the on-call contracts. First, they allow Sain Associates to work with ALDOT on a range of projects. Over the years, the projects have ranged from surveying to corridor and traffic studies to a broad array […]
Geographic Information System (GIS) is a computer system for capturing, storing, checking, and displaying data related to positions on the Earth’s surface. This system utilizes a combination of computerized drafting technology (for drawing point, line, and polygon features that represent real world objects) and relational database technology (for storing detailed information about those objects).
By Justin Watson, E.I., Infrastructure Designer Roadway signing can directly affect the safety of the public by warning drivers and pedestrians of any number of roadway hazards, traffic maneuvers, navigation information, etc. Signing and/or resigning is one aspect of a safety project where the designer relays active information to the driver, whereas things such as […]
By Mark Randall, P.E. Similar to how NASCAR tracks utilize “banking” to help a car’s downforce and velocity through a turn, civil engineers use superelevation on regular roadways to do the same thing. While some tracks, such as the Talladega Superspeedway, are banked up to 33 degrees (an increase of 6.5’ in vertical elevation every […]
Posted by Nathan Currie, P.E. Although Alabama does not have as many roundabouts as some of its neighboring states, such as Florida or Georgia, these intersections are becoming more common throughout the state. This could be due to the Alabama Department of Transportation (ALDOT)’s 2015 release of a Roundabout Planning, Design, and Operations Manual providing […]
As civil engineers and surveyors, there are many aspects of our daily jobs that are second nature to us. But we hear common questions about our field often from the public. In this “Did You Know” blog series, we’ll answer some of these questions. The Federal Highway Administration’s guidebook entitled Flexibility in Highway Design stresses the importance […]