Thursday, June 9, 2011

Why does ADOT replace perfectly good highway signs?

ADOT's Interstate Signing Supervisor
Dudley Heller shows an example of a
worn out sign that was replaced.
We received a question on our Facebook page last week asking us why, in this time of tight state budgets, ADOT is spending money to swap out what appear to be perfectly good highway signs. We thought it was a great question, so here’s the answer…

The primary reason is simple: Safety!

All highway signs – from green guide signs, to white speed limit signs, to blue service signs - are coated with a special reflective material that helps drivers see them clearly at night. The official term is retroreflectivity: a material’s ability to return (retro) most of the light back to its originating light source, in this case, back to the vehicle.

Signs that are damaged, weathered, or worn, can still appear perfect during the daylight hours, but in reality, the reflective surfaces may have already begun to deteriorate, making it hard to read at night. And while only one-quarter of all travel occurs at night, approximately half of all traffic fatalities occur at this time.

ADOT maintains roughly 500,000 signs around the state, most of which have an average life span of 10-15 years. ADOT swaps out the old signs based on which section of highway needs it the most.

The current sign rehabilitation program, which includes replacing signs along I-8, I-10, I-17, I-40 and State Route 51, is funded primarily through federal funds specifically dedicated for highway signage. Over the next five years, $5 million will be spent on freeway sign replacement efforts.

In addition to replacing aged signs, ADOT will update sign legends and add new city names to meet the needs of Arizona’s changing and growing communities. ADOT crews also will replace sign posts and foundations that do not meet current structural standards for height or placement location.

Signs are also replaced during highway widening projects such as the Loop 101 HOV project in Phoenix.
Posted by Angela DeWelles   |  Labels:  ADOT, I-10, I-17, I-40, I-8, Safety, SIGNS, Valley-Freeways, Valley-Freeways-Thursday


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

Civil Rights

Pursuant to Title VI of the Civil Rights Act of 1964, the Americans with Disabilities Act (ADA) and other nondiscrimination laws and authorities, ADOT does not discriminate on the basis of race, color, national origin, sex, age, 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, la Ley de Estadounidenses con Discapacidades (ADA por sus siglas en inglés) y otras normas y leyes antidiscriminatorias, el Departamento de Transporte de Arizona (ADOT) no discrimina por motivos de raza, color, origen nacional, sexo, edad o discapacidad. Las personas que requieran asistencia (dentro de lo razonable) ya sea por el idioma o discapacidad deben ponerse en contacto con la Oficina de Derechos Civiles de ADOT en Las solicitudes deben hacerse lo más antes posible para asegurar que el Estado tenga la oportunidad de hacer los arreglos necesarios.