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Engineering for Accessibility

A transportation system that provides full accessibility results in a high quality system for all users. Accessible infrastructure has been linked to increased business opportunities, social development health benefits, and increased independence among community members.

Accessible design practices incorporate the needs of people with disabilities into the design and development of public infrastructure, allowing facilities to be accessed independently by people with disabilities. ​

The Americans with Disabilities Act requires pedestrian infrastructure be accessible and usable by people of all abilities. Some elements of an accessible pedestrian route include:

  • Sidewalks,
  • Curb ramps,
  • Crosswalks,
  • ​Pushbuttons at traffic signals, and
  • Accessible parking.

ADA requirements are integrated into all Oregon Department of Transportation standard drawings, details, specifications and design manuals. In addition, ODOT prepares guidance and element designs to maximize accessibility in new construction and existing facilities. Technical guidance documents clarify when, where, and how to provide access in the many unique situations found along the state highway system.​

Project Elements that Impact ADA Accessibility

For each project element, technical requirements are provided to guide the design of accessible public facilities. Project requirements for ADA can be found in the ADA Curb Ramp Process document.

​When curb ramps are included in a project, ODOT requires several processes to ensure the constructed curb ramp will comply with accessibility requirements. The processes are summarized in the ODOT ADA Curb Ramp Process document.

  • Design shall meet criteria in the ADA Curb Ramp Design Checklist,
  • Design detail sheet shall be provided for each corner, and
  • Constructed curb ramps must be inspected using an ODOT curb ramp inspection form to document compliance with accessibility requirements.

Technical Requirements

  • Curb Ramp Design Checklist
    • Exhibit B - Curb ramp style co​mpanion document. Please note: Standard drawings and design manual must be used to design curb ramp​s.​
    • Exhibit D - Illustrates the gutter flow slope requirements, based on the intersection control type.
  • ADA Curb Ramp Design Exceptions
  • RD16-01(B) - ADA Curb Ramp Design Exception Form and ADA Curb Ramp Guidance
  • RD17-01(B) - ADA Sidewalk Curb Ramp Detail: Minimum Requirements in Construction Plans
  • TSB18-03(D) - Curb Ramp Scoping and Right of Way
  • RD21-01(A) - Curb Ramp Gutter Flow Slop Design and Design Exceptions


External References

2021-2022 ADA Program Funded Retrofit Design Guidance

​An accessible path of travel is required on walkways to ensure an equitable transportation system and to provide transportation options for all users. The following documents explain requirements related to walkways.

Technical Requirements

The following documents explain walkway requirements.

The ADA requires that curb ramps be addressed when street pavement is altered with resurfacing. Curb ramps must be placed where they are needed or replaced if they are not compliant.

Technical Requirements

The following documents explain overarching project requirements, clarify ADA obligations for paving or resurfacing projects, and detail requirements for ongoing maintenance.

An accessibility evaluation of bridge sidewalks is required when:

  • A bridge is constructed;
  • A sidewalk is added to an existing bridge; or
  • The scope of work is classified as an "alteration."

Required ADA upgrades may be triggered by bridge rehabilitation and maintenance projects. See BDM Chapter 1, Section 16 for additional information.

Technical Requirements

The following documents explain requirements related to bridge sidewalk and curb ramp elements.


​Per Oregon statute, every intersection is a pedestrian crossing unless the crossing is closed by official action.

Closing a Crossing

For ODOT highways, use the process detailed in the Traffic Manual. The state traffic roadway engineer approves all requests for crossing closures.

Use local jurisdiction approval processes when requesting a closure for a road owned by a local municipality.

Technical Requirements



​The location of pedestrian signal equipment should be determined in conjunction with the curb ramp and crosswalk layout.

You must evaluate the pedestrian push buttons for accessibility triggers as well as the surrounding area for reach, range and landing requirements, when a project includes any of the following elements:

  • Signalized intersections
  • Rectangular rapid flashing beacons
  • Pedestrian hybrid beacons

Accessible pushbuttons are required when traffic signal work is considered to be an alteration.

Technical Requirements

Technical guidance documents TR16-01(B) and TR16-02(B) have been incorporated into the Signal Design Manual​. These documents discussed requirements for pedestrian signal equipment and audible pedestrian signals.

The following document explains maintenance work requirements.

  • MG 144-03 - Traffic Signal Maintenance and Americans with Disabilities Act



Transit services provide a critical public service for people to complete a trip destination. Transit services stops requires a clear accessible area to board and exit the vehicle. Accessible routes must be provided from the transit stop to features including benches, shelters, ticket stations, parking lots and public buildings.

Technical Requirements

The following document explains requirements related to transit service stations.


  • RD908 – Detectable Warning Placement for Transit and Rail Services


​Accessible parking spaces must be addressed when a project alters a parking lot or on-street parking that is metered or marked.

If sidewalks and pavement are altered, the parking access aisle must also be addressed.


A Temporary Pedestrian Accessible Route is a required component of every Traffic Control Plan.

The TPAR details how pedestrians will be directed through or around a work zone. The level of detail required for the TPAR depends on the complexity of the project and the volume of pedestrian traffic.

Review frequently asked questions​ about temporary pedestrian accessible route design and construction.

Technical Requirements

  • TSB17-01(D) - Temporary Pedestrian Accessible Route Plans Required for Work Zones
  • MG Activities 2​ - Maintaining Accessibility During Maintenance Work



​ODOT ensures that ADA processes are followed on federal-aid local projects, including for those certified local public agencies that do not have ADA certification from FHWA and ODOT.

Technical Requirements

  • LPA 101-19 - Americans with Disabilities Act Design Exceptions and Inspections

Curb Ramp Inventory and Inspection Resources

ODOT maintains an inventory of curb ramps on state highways. The inventory data is collected from on-site visual inspections conducted statewide by certified inspectors.

Inspection Training

In this time of social distancing, ODOT has cancelled in-person construction training through June 30. While in-person trainings are cancelled, online training is available.

All personnel who perform ADA inspections/construction must be certified. Individuals may sign up for one of the virtual classes set up through iLearn. The short-term ADA certification will expire on December 31, 2020.

The ODOT Inspection Quality Assurance Program maintains a list of inspector certifications. 

If you have any questions, please contact us by email by phone at 503-986-4336.

ODOT provides training for ADA curb ramp inspectors. We've answered some frequently asked questions​ about the 2020 recertification inspection course. This course provides information on the equipment, measurements and procedures required to conduct inspections. Review the supplemental information about curb ramp inspections we have received during past training sessions.

Exhibit A: Curb Ramp Location and Numbering - Instructions on how to properly assign corner and ramp position numbers for curb ramp inventory. For unique intersections, please consult with the inventory and mapping specialist.​​

Technical Requirements​

  • RD19-02(B) - Measurement Criteria for Newly Const​ructe​d Curb Ramps, Driveways and Sidewalks

Curb Ramp Inspection Forms and Guides

The following guides and resources are intended for use by ODOT certified ADA inspectors.

Inspector Guide for Curb Ramps and Push Buttons - Provides a general overview of definitions, methods of measure and documentation requirements required for ODOT curb ramp inspections.

ADA Curb Ramp Inspection Form Submittal Guide

Curb Ramp Inspection Standard Comments

Standard Comments (Abbreviated Version)

Select the form that best suits your project:​

Push Button Inspection Forms

ADA Push Button Inspection Form Submittal Guide

Exhibit​ C: Push Button Clear Space Surface Types​ - This companion document aids in identification and inspection of the push button installation.

Select the form that best suits your project:

Inventory information includes the functional and physical condition of a given curb ramp, and if the ramp meets ADA standards.

  1. Visit the TransGIS website.
  2. Under the "layers Catalog" tab, select "Roadside."
  3. Select the "ADA Ramps"​ box.
  4. Click "Apply" at the bottom of the "Layers Catalog" window.
  5. Zoom into an area of interest by double-clicking the area or using the scroll wheel on your mouse.
  6. Click the blue information icon at the top of the window and click on a curb ramp marker.
  7. Information about the selected curb ramp will appear in a secondary window.

TransGIS mapping tool

Corner locations statewide

Contact the Roadway Engineering Unit

4040 Fairview Industrial Drive SE, MS 5
Salem, Oregon 97302
Phone: 503-986-3568
Fax: 503-986-3749

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