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Metro Stations served: Wiehle - Reston East (Silver)
Route serves: Herndon-Monroe Park and Ride, Glade Drive, Colts Neck Road, South Lakes Drive, Sunrise Valley Drive
Route operates: Weekdays
Hours operated:
- Weekdays: 4:30 a.m. - 10:30 p.m.
Frequency of service:
- Weekdays:
  - 4:30 – 8:30 a.m.: every 15 minutes (coordinates with RIBS 2 to provide this frequency)
  - 8:30 a.m. – 4:30 p.m.: every 30 minutes (coordinates with RIBS 2 to provide this frequency)
  - 4:30 – 8 p.m.: every 15 minutes (coordinates with RIBS 2 to provide this frequency)
  - 8 – 10:30 p.m.: every 30 minutes (coordinates with RIBS 2 to provide this frequency)
Direction:
- AM: East
- PM: West
View optional service for Route 551