Detroit Department of Transportation (DDOT)

Top things to fix

Score by category

Over time

Overall score across the last 20 checks — unchanged since 2026-07-08.

What changed since your last check

• Correctness— no change
• Freshness— no change
• Rider experience— no change

What changed in this feed

Overall grade and score held steady since 2026-07-08.

Same feed file as 2026-07-08; the published zip did not change.

Subscribe to this feed’s changes (Atom) to hear about grade drops in a reader, with no sign-up.

What changed over time

On 2026-06-19 this feed started at grade F. On 2026-06-24 the grade moved from F to C. On 2026-06-25 the grade moved from C to F. On 2026-07-01 the grade moved from F to C. As of 2026-07-09 it holds grade F.

A plain-language history of this feed, newest first.

• 2026-07-07 Grade went C to F, freshness fell 100 points.
• 2026-07-01 Grade went F to C, freshness rose 95 points.
• 2026-06-25 Grade went C to F, freshness fell 87 points.
• 2026-06-24 Grade went F to C, freshness rose 83 points.

Everything we checked

• Error104 instances

  Block trips with overlapping stop times (flagged by the MobilityData validator).

  See the linked rule for what this affects.

  Fix: Review the rule documentation for 'block_trips_with_overlapping_stop_times' at https://gtfs-validator.mobilitydata.org/rules.html and check the flagged rows in your feed. (Varies.)

  Agencies here usually clear this within about 1 week (based on 5 observed fixes).

  Validator rule: block_trips_with_overlapping_stop_times · See MobilityData GTFS Validator rules (opens the validator rules on an external site)

• Error1 instance

  Service data ended 6 day(s) ago.

  When the calendar runs out, trip planners stop showing this agency even though the buses are still running. Riders are told the service does not exist.

  Fix: Re-export the feed with a calendar that reaches further out, and set feed_info feed_end_date past your next service change. (Usually one export setting; export on a schedule so it never lapses again.)

  Agencies here usually clear this within about 1 week (based on 18 observed fixes).

  Validator rule: scorecard_feed_expired · Read the fix guide · See GTFS Best Practices (opens GTFS Best Practices on an external site)

• Warning5872 instances

  5872 of 5872 trips don't say whether the vehicle is wheelchair accessible.

  Even with accessible stops, riders need to know the bus itself can take them.

  Fix: Set wheelchair_accessible on every trip (most small-agency fleets are 100% accessible, so this is often a single default). (Often one default setting in your export.)

  Agencies here usually clear this within about 1 week (based on 5 observed fixes).

  Validator rule: scorecard_wheelchair_accessible_unknown · Read the fix guide · See GTFS Schedule reference (opens the GTFS Schedule reference on an external site)

• Warning5120 instances

  5120 of 5120 stops don't say whether a wheelchair user can board there.

  Riders who use wheelchairs can't plan a trip when accessibility is marked 'unknown'; apps show no information at all.

  Fix: Set wheelchair_boarding to 1 (accessible) or 2 (not accessible) for every stop. A field survey can start with the busiest stops. (A column in stops.txt; your scheduling software likely has it.)

  Validator rule: scorecard_wheelchair_boarding_unknown · Read the fix guide · See GTFS Schedule reference (opens the GTFS Schedule reference on an external site)

• Warning225 instances

  Some scheduled trips move faster between stops than a bus can.

  Usually a typo'd stop time; riders get arrival times no bus can meet.

  Fix: Check the flagged stop times for transposed minutes. (A few minutes per flagged trip.)

  Agencies here usually clear this within about 2 weeks (based on 6 observed fixes).

  Validator rule: fast_travel_between_consecutive_stops · Read the fix guide · See MobilityData GTFS Validator rules (opens the validator rules on an external site)

• Warning10 instances

  Some stops exist in the feed but no trip ever stops at them.

  Riders may walk to a stop where no bus is scheduled to arrive.

  Fix: Remove retired stops from the export, or add them back to the trips that should serve them. (A review pass in your scheduling software.)

  Agencies here usually clear this within about 1 week (based on 11 observed fixes).

  Validator rule: stop_without_stop_time · Read the fix guide · See MobilityData GTFS Validator rules (opens the validator rules on an external site)

• Warning3 instances

  Some files leave out fields that GTFS asks for but does not require.

  Recommended fields like agency_phone or stop descriptions make the feed more useful to riders and trip planners.

  Fix: Review the flagged fields and fill in the ones your riders would use. (A field at a time; not urgent.)

  Agencies here usually clear this within about 2 weeks (based on 8 observed fixes).

  Validator rule: missing_recommended_field · Read the fix guide · See MobilityData GTFS Validator rules (opens the validator rules on an external site)

• Warning1 instance

  This feed's service calendar runs out within the next 30 days.

  If a new feed isn't published before it ends, trip planners will drop your agency and riders will see no service.

  Fix: Schedule a feed re-export now so the new calendar is live well before the current one ends. (Usually a re-export from your scheduling software.)

  Agencies here usually clear this within about 1 week (based on 24 observed fixes).

  Validator rule: feed_expiration_date30_days · Read the fix guide · See MobilityData GTFS Validator rules (opens the validator rules on an external site)

• Warning1 instance

  Missing feed contact email and url (flagged by the MobilityData validator).

  See the linked rule for what this affects.

  Fix: Review the rule documentation for 'missing_feed_contact_email_and_url' at https://gtfs-validator.mobilitydata.org/rules.html and check the flagged rows in your feed. (Varies.)

  Agencies here usually clear this within about 1 week (based on 6 observed fixes).

  Validator rule: missing_feed_contact_email_and_url · Read the fix guide · See MobilityData GTFS Validator rules (opens the validator rules on an external site)

• Warning1 instance

  The feed contains route shapes no trip uses.

  Harmless to riders, but it bloats the feed and suggests stale export data.

  Fix: Turn on 'remove unused shapes' (or the like) in your export tool. (One setting.)

  Validator rule: unused_shape · Read the fix guide · See MobilityData GTFS Validator rules (opens the validator rules on an external site)

• Info40 instances

  Trip headsign matches intermediate stop (flagged by the MobilityData validator).

  See the linked rule for what this affects.

  Fix: Review the rule documentation for 'trip_headsign_matches_intermediate_stop' at https://gtfs-validator.mobilitydata.org/rules.html and check the flagged rows in your feed. (Varies.)

  Validator rule: trip_headsign_matches_intermediate_stop · See MobilityData GTFS Validator rules (opens the validator rules on an external site)

• Info3 instances

  Service window outside feed period (flagged by the MobilityData validator).

  See the linked rule for what this affects.

  Fix: Review the rule documentation for 'service_window_outside_feed_period' at https://gtfs-validator.mobilitydata.org/rules.html and check the flagged rows in your feed. (Varies.)

  Agencies here usually clear this within about 1 week (based on 17 observed fixes).

  Validator rule: service_window_outside_feed_period · Read the fix guide · See MobilityData GTFS Validator rules (opens the validator rules on an external site)

• Info1 instance

  feed_info.txt has no technical contact (feed_contact_email or feed_contact_url).

  App makers and state data programs have nobody to email when they spot a problem with your feed, so problems linger.

  Fix: Add feed_contact_email to feed_info.txt. (One field.)

  Agencies here usually clear this within about 1 week (based on 10 observed fixes).

  Validator rule: scorecard_no_feed_contact · Read the fix guide · See MobilityData GTFS Validator rules (opens the validator rules on an external site)

Beyond the grade

Opportunities that do not change your grade today: fare detail, on-demand service, and deeper accessibility data.

• 11 route badge(s) pair a color and text color below the WCAG 4.5:1 contrast bar (16, 17, 18, 19, 23, and more).

  Consider: Adjust route_color or route_text_color so each pair clears 4.5:1. Often switching the text between black and white is enough.

• 5088 stop name(s) use abbreviations or symbols a screen reader may mispronounce, with no spoken form set ("Cadillac & Chapin", "Cadillac & Barker", "Harper & Chalmers", and more).

  Consider: Add tts_stop_name with the spoken form, e.g. 'Main Street and Second Avenue', for the affected stops.