Duval's headed for the airport, heading back to San Francisco. Thing is you just left there and are in no mood to return. Duval is a better driver than the other previously, and uses traffic to shield himself from you. However you have one advantage- you know where he's headed. The area marked LAX in the South. You also have hopefully improved your driving so this should pose little threat to you. Just in case you are interested, that message was used in the first PSM demo (44) but that was in Miami.