BART has six rapid transit services (five primary services plus the SFO–Millbrae shuttle); all six lines share track with other lines. As BART operates between the traditional rapid transit and commuter rail service types, frequencies are lower than most rapid transit systems. Trains on each primary service run every 15 minutes on weekdays (with some additional peak-hour trains on the Antioch–SFO/Millbrae line), excluding the shuttle which runs every 30 minutes. Trains run every 20 minutes on weekday evenings and Saturdays, and every 24 minutes on weeknights and Sundays. Segments served by multiple lines have higher frequencies, the busiest of which is the section between Daly City and West Oakland, which has around 20 trains per hour per direction at peak hours. The eBART section of the Antioch–SFO/Millbrae line matches the frequency of the rest of the line, except for peak hours when it runs every 15 minutes. The Coliseum–Oakland International Airport line runs every 6 minutes until 11:00 pm and approximately every 24 minutes thereafter. All service is reduced during the COVID-19 pandemic, with 30-minute headways at most times; service ends at 9 pm.