Wednesday, January 22, 2014

Components of a plan set

Engineers are a valuable resource for the ADOT Blog. We quote them, film them and use their knowledge so we can better explain to you many of our more complex transportation topics.

Without the expertise of ADOT’s engineers, this blog just wouldn’t be the resource that it has become over the past three years. We definitely appreciate our engineers, which is why we’re so glad to share today’s guest blog post with you.

It comes from one of ADOT’s Engineers in Training. We blogged about this innovative program back in 2012, but basically EITs follow a structured program working in varied sections within ADOT. Their time is divided into training blocks that last two and four months. A few of the blocks are mandatory and others are selected by the EIT.

Our guest blogger Elizabeth Weil made the choice to rotate through ADOT’s communications division for one of her blocks! Her time here has included learning about the many ways ADOT communicates with the public. Today, she writes about construction plans and explains some of their different components

By Elizabeth Weil
Transportation Engineering Associate
We draw them, we review them, and we use them during construction, because they tell us what to do. Roadway plans are common around ADOT amongst designers and construction personnel, but you’ve probably never seen them for yourself. Here are just a few things that we include in plan sets.

Pavement structural sections (above) describe the layers of a roadway. In this example, above the subgrade (the ground below the roadway material) goes 5 inches of AB (aggregate base, a specific size of rock), then a layer of AC (asphalt, or “asphaltic concrete”), a tack coat (an adhesive oil used to make layers of asphalt stick to each other), and another layer of AC on top.

A typical section shows (above) which structural sections are used in specific areas. They’re accompanied by station limits (in this case 1086+00.00 to 1089+02.07). Those numbers refer to a specific location in the same way a milepost would. This typical section also gives a distance from the right-of-way line to the centerline of the road, the slope of the roadway, and widths of the lanes and shoulders. This way, we know exactly where the roadway will go and how big it will be. Think of the typical section as a cross-section of the roadway; if you were driving, you’d be moving into or out of the page.

This is just part of a sheet showing the plan view of the roadway (a bird’s-eye view). There is a lot of information on each of these sheets- this section of roadway has a taper (where the width of the roadway changes), guardrail (the numbers in diamonds are pointing at it), and right of way (the dashed lines near the outside). Numbers in the shapes are referring to a summary sheet which I haven’t included in this post, but each summary gives much more information (such as guardrail lengths).

Lastly, if you were wondering, we don’t usually have numbers in red; these screenshots were taken from our drafting guidelines which exist so we can make our plans as consistent as possible to avoid confusion.
Posted by Angela DeWelles   |  Labels:  EIT, Engineers, Guest-Blog, Plans


The Arizona Ombudsman – Citizens Aide helps citizens to resolve ongoing issues with State Agencies.

Civil RightsTitle VI of the Civil Rights Act of 1964, and the Americans with Disabilities Act (ADA)

Pursuant to Title VI of the Civil Rights Act of 1964, and the Americans with Disabilities Act (ADA), ADOT does not discriminate on the basis of race, color, national origin, age, sex or disability. Persons that require a reasonable accommodation based on language or disability should contact ADOT’s Civil Rights Office at Requests should be made as early as possible to ensure the State has an opportunity to address the accommodation.

De acuerdo con el título VI de la Ley de Derechos Civiles de 1964 y la Ley de Estadounidenses con Discapacidades (ADA por sus siglas en inglés), el Departamento de Transporte de Arizona (ADOT por sus siglas en inglés) no discrimina por raza, color, nacionalidad, edad, género o discapacidad.  Personas que requieren asistencia (dentro de lo razonable) ya sea por el idioma o por discapacidad deben ponerse en contacto con la Oficina de Derechos Civiles en Las solicitudes deben hacerse lo más pronto posible para asegurar que el equipo encargado del proyecto tenga la oportunidad de hacer los arreglos necesarios.