That's right. Where your route ends, make a left and you should see a very rough path. Follow it down and to the left, and it will lead you underneath the 405. Watch for lots of broken glass under the freeway. After passing underneath the freeway, you'll come to a chainlink fence blocking the path. Just walk your bike around it to the right. Then you may proceed towards Irvine Center Drive. As of today, there are unfinished manhole covers so keep your eyes open lest you destroy both wheels rolling over them at speed.
You may bypass this entire area by using the newly completed Lake Forest Road. It connects CA133 to Laguna Hills. So from Irvine Civic center (assuming you are coming from Alton or Barannca) you would go right on Laguna Canyon (pass over the freeway and traffic circle), then cross CA133 into Laguna Altura. Laguna Altura will lead you to Lake Forest Road where you will make a left. This gets you into Laguna Hills, and will lead you to Moulton, etc.
Last edited by idoru2005; 03-21-13 at 02:45 PM.