nbc's barr rob redell is there. bob? >> reporter: good morning to you, marcus. anyone here northbound 680 knows in a few hours from now this traffic will be bumper to bumper. that's why this is considered to be the sixth most congested corridor in the bay area. that's why about 30 minutes from now see the shovels here, the alameda county commission and cal transworking on a lane and fourth lane to become a hot lane. take a look at the map and show you the area we are talking about. nine miles of a hot lane starting from automall expressway from fremont to just past highway 84. that's, of course, the exit to liver more. not familiar with the hot lanes, they've been in the bay area quite some time and free for people carpoolers to use or people with the clean air vehicle stickers for free or if you're a solo vehicle driver and you have a fast track tag you can use it, as well. of course, you have to pay a toll and the toll fluctuates on demand. we have arthur doll here with the commission. we are talking about the simpdi you think it will make. what will it be lik