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DDOT Traffic Safety Input

Traffic Safety Input


A Traffic Safety Input is a  311 service request submitted by a resident, ANC, or other community member or organization that will be prioritized based on objective factors such as roadway characteristics, crash patterns, equity, proximity to Vision Zero High Injury Network corridors, and locations used by vulnerable road users such as schools, Metro rails stations, and bus stops. Based on these factors, DDOT’s Traffic Safety Branch will develop a work plan for 200 prioritized locations each quarter to evaluate the extent of the safety concerns expressed by the public and determine if any action is recommended.


Please USE a Traffic Safety Input 311 service request to report issues such as:


·              Safety concerns for pedestrians, people biking, or taking transit.

·              Unmarked or marked crosswalks that appear unsafe (Maintenance for existing markings should be put in under the 311 request, Roadway Striping / Markings).

·              Traffic safety issues around schools.

·              Concerns about speeding drivers or speed limits in general (Note: DDOT's policy on speed limits is 20 MPH for local roads and may vary for Arterial and Collector roadways).


Please DO NOT use a Traffic Safety Input 311 service request to report the following:


·              EMERGENCIES: Dial 9-1-1 for immediate fire, police, or medical response.

·              URGENT MAINTENANCE: Call 311 for immediate response to matters requiring urgent maintenance.

·              MAINTENANCE OF EXISTING INFRASTRUCTURE: Use the 311 maintenance request type for issues related to existing Roadway Signs, Traffic Signal Issues, Sidewalk Repair, Roadway Markings, Tree Pruning, or Roadway Repair (including speed hump repair requests).


In order to submit a Traffic Safety Input service request, residents should call 311 or visit  311 online and answer all required 311 service request questions. A petition or a letter of support from the ANC commissioner is not required.


What to Expect


After submitting a Traffic Safety Input service request, you will receive a message acknowledging receipt and your request will be automatically added to the TSI system for prioritization. The prioritization is based on objective factors such as roadway characteristics (such as the number of lanes, traffic controls, etc.), crash patterns, race, and social equity, proximity to Vision Zero High Injury Network corridors, and locations with concentrations of vulnerable road users such as schools, senior centers, Metro rail stations, and bus stops. TSIs ranking in the top 200 each quarter based on these criteria will be advanced to engineering evaluation. Any TSIs not ranking in the top 200 will remain in the system for prioritization in future quarters.  


The evaluation of prioritized TSIs may involve the following steps:


  • Preliminary Engineering Evaluation: After prioritized Traffic Safety Inputs are identified and added to our quarterly work plan, DDOT reviews the information, checks for existing data and studies, and conducts site visits and other reviews to determine whether the location warrants further data collection and potential safety treatments.


  • Pending Data Collection: Traffic Safety Input requests may be sent for data collection depending on the type of intervention and roadway classification. Changes that would require data collection include but are not limited to intersection signalization, lane configuration changes, vertical traffic calming (e.g. speed humps) on local roads, one-way conversions, stop signs, and other traffic calming measures. Once data collection is completed, DDOT will review the study results to determine what mitigation measures are recommended.


  • Publication of Next Steps: For prioritized TSIs, DDOT will post an explanation of our next steps to the TSI Dashboard following the completion of our engineering evaluation. If safety mitigation is necessary, DDOT will provide the details of the proposed improvements. If no changes are recommended, we will provide an explanation for our decision.


  • Implementation of Safety Mitigations: If safety mitigation is deemed necessary, then DDOT develops recommendations and prepares the corresponding engineering design (work order). If recommendations change existing traffic control and/or on-street parking, a  Notice of Intent (NOI)  will be required. The NOI includes a 30 business-day public comment period. The timeline for the installation of improvements will vary based on the safety mitigation identified.  


Navigating this Dashboard:


This dashboard contains information about Traffic Safety Input requests received by DDOT.


Please use the filters on the top of every tab to filter by Ward, ANC, SMD, and Service Request number.

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