No, I don't think just making public transport free will solve traffic problems. People often prefer the comfort of their own cars, and if the public transport isn't good enough, they won't use it even if it's free.
No, no creo que simplemente hacer que el transporte público sea gratuito resolverá los problemas de tráfico. La gente a menudo prefiere la comodidad de sus propios autos, y si el transporte público no es lo suficientemente bueno, no lo usarán incluso si es gratuito.