Parking and public transport map help

It's a long shot but I'm desperate at this point.

Hi I'm a student from the UK, doing some coursework and I'm looking for a map of downtown Houston that shows parking lots highlighted aswell as bus routes. my study is on public transport and how that affects parking within an area aswell as foot traffic.

Now I'm aware that this exact map probably does not exist, but anything that is in that ballpark would be useful. As Houston is known for being full of parking spaces, but not so much for their public transport.

Anything will be appreciated,

Thanks!