. >> reporter: mike mckaren said they see more close calls because of the two perpendicular runways. >> it is not the issue. but the human element and make it as simple as possible and make them understand these procedures need to be followed. >> reporter: there were highway mishaps here and limb the calls between planes and they are now putting in runway status lights so pilots know when it is safe to go. >> red and green stop lights. and it is red bar. and green, you have to cross. so, should make it easier especially with the layout and with the instructions. >> with all of them at sfo, a faa spokesperson tells ktvu, there was ample time and distance to avoid a collision. >> they helped the runway. mishaps are handled and they are not worried about safety. >> it is not something that crosses my mind. there are thousands and thousands of flights a day and you have more chance you know, getting in car accident. >> reporter: across the country last year, the faa reports there were 954 runway incursions and a spokesman said passengers were never in any danger. the new warning system w

. >> reporter: thank you for joining us live, mike mckaren with sfo. i'm tara moriarty, ktvu channel 2 news. >> all right, tara. >>> 7:05. concerned growing this concerning about a walnut creek high school student who has been missing for almost a week. 16-year-old la ris ta -- larissa huntsman was last seen leaving the high school. police don't suspect foul play. show has a medical condition and does not have her medicine with her. she was last seen wearing a blue shirt and blue shoes. >>> the republican convention wraps up with the main event -- mitt romney's acceptance speech. >> after four years of getting the runaround, america needs a turnaround and the man for the job is governor mitt romney. >> coming up at 7:15, we'll go live to tampa where ken pritchett is getting row action from california delegates and a look at changes taking place. >>> continuing coverage on isaac. the first fatality from the storm is being reported in mississippi. a tow truck driver was struck boy a falling tree. elizabeth pramm joins us live from new orleans where isaac