Charles Cochran, a Project Manager on the Traffic [...]
Did You Know? Rumble Strips
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 […]
Did You Know? Traffic Loons
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 […]
Did You Know? On-Call Contracts
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 […]
Did You Know: GIS Mapping
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).
Did You Know: Roadway Signing
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 […]
Did You Know: Superelevation
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 […]
Did You Know: Roundabouts
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 […]
Did You Know: Roadway Design and Guardrails
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 […]
Did You Know: How Speed Limits Are Determined
Speed limits are used to set the maximum (or minimum in some cases) speed at which vehicles may legally travel on particular stretches of road. Speed limits in the United States vary depending on jurisdiction, with 75 to 85 mph common on interstate highways in the Western United States and 65 to 70 mph common […]
Did You Know: The Difference Between Detention Ponds and Retention Ponds
As cities grow and land development expands, properly diverting water becomes an important issue. Cities typically require that the developer not increase the amount of water discharging from the site after construction is complete. In order to control excess water and prevent runoff, or the water that flows downhill after a storm, detention or retention ponds are used to prevent any flooding or erosion.