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Location​​​ Hours of Operation Type of entrance
NIH Gateway Drive on Rockville Pike & NIH Gateway Drive.Weekdays: 4am - 10pm
Weekends :6am - 10pm
Main vehicle entrance
Gateway Inspection Station, Building 66A on Rockville Pike & NIH Gateway DriveWeekdays: 4am - 4pm
Before 4am and after 4pm on weekdays and on weekends, all vehicles should enter campus through the Commercial Vehicle Inspection Facility (CVIF) - Building 67.
Vehicle entrance
NIH Gateway Center, Building 66 on Rockville Pike & NIH Gateway Drive. Weekdays: 6am - 10pm
Closed on weekends and Observed Holidays. After 10 pm on weekdays, all day weekends and holidays, pedestrian visitors should enter campus via the Commercial Vehicle Inspection Facility (CVIF) – Building 67.
Pedestrian entrance
West Drive Patient Entrance on 5300 West Cedar Lane. 7 days a week: 6am – 10pm
After 10 pm on weekdays, all day weekends and holidays, patients and their visitors should enter campus via the Commercial Vehicle Inspection Facility (CVIF) - Building 67.
Patients and their visitors' entrance
Commercial Vehicle Inspection Facility (CVIF) Building 67 on Rockville Pike between North Dr. and Wilson Dr. 24 hours a day, 7 days a week. 
After 4pm on weekdays, all day weekends and holidays, all visitors in vehicles should enter via the CVIF. After 10pm on weekdays and holidays, pedestrians should enter via the CVIF.
Commercial vehicles and after-hours vehicles and pedestrians.​

See map for more details:

https://ors.od.nih.gov/maps/Pages/default.aspx