700€/year is about 60€/month, which is fairly typical for a regional monthly public transport pass. Considering we pay around 7 USD/gal for fuel (1.6€/l), if your work is more than about 30 car-minutes away it's cheaper to commute by public transit (assuming you park for free). And that's not even considering that you might be able to have fewer cars in the household: just owning the car is a lot more expensive than the transit pass.