While these problems affected the efficiency and effectiveness of road-based public transportation (e.g. requiring passengers to transfer more often between feeder buses, trunk buses and the Metro), they also affected the overall public transport system, including the Metro. Transantiago’s initial design and service deficiencies dramatically increased demand for and use of the Metro system. From 2006 to 2007, the number of passengers using the Metro practically doubled, generating major congestion and service problems.