Probably cars as a whole. Based on other such places (I know nothing about Seattle) they have no clue what cars are costing, but they know some people get there by car so they are scared to lose them.
[1] https://i.imgur.com/HYrANj7.jpg [2] https://goo.gl/maps/aqoNGXTLCxgD5XdW7 [3] https://en.wikipedia.org/wiki/Pike_Place_Market
It would make a lot of sense to pedestrianize Pike Pl and maybe couple of surrounding streets.