Where are these murals?

Gayle (Alexandra's Mom) writes: You might catch the tiniest glimpse of this long wall of murals if you're on a southbound trolley or train heading into Old Town. Otherwise, there's not much chance you've ever seen them. They're along the new walk/bike path under construction from Mission Valley to Ocean Beach, at the point where it passes under the 8&5 freeway snarl. Yes, you can actually walk the whole way, if you're feeling adventurous. But you might want to avoid some of the seedier underpasses along the way.
And from this point on, the north side of the river channel along Sea World Drive is a pleasanter walk (away from the freeway noise). You can get to these murals from Pacific Highway, if you're interested.