The only people I have known who have driven from ZIH to ACA (or vice versa) were stopped at gunpoint and had all of their possessions removed - including cash, jewelry, and all identification. So no driving or bus for us - thank you anyway!!! considering the fact that they were both beautiful French young ladies, I'm surprised they weren't molested. The drive from SAN to LAX is also torturous and usually involves an overnight in MEX when traveling by Aeromexico. And no more Mexicana! The Feb. service from IAH is promising.