OK,to answer the question, must drivers will have Traffic tracking devices, such as GPS with live traffic updates. (I use a TomTom that use radio waves to get the info, not using my smartphone battery, can use it for other things if someone else is driving, also less likely to signal loss.)
If you want to know what is happening, I would use the region's newspaper website to see if there is anything going on that is "newsworthy" when you arrive.
www.latimes.com
Last night this was reported.
http://www.latimes.com/local/lanow/la-me-anti-trump-protests-los-angeles20161111-story.html
>>
The CHP, whose officers blocked on ramps and off ramps throughout downtown, thwarted a group of demonstrators from entering the 110 Freeway.
“We’re trying to take a proactive approach to prevent them from getting on there,” CHP Officer Stephan Brandt said.<<
Closer to
Disneyland, on Friday...
http://www.latimes.com/socal/daily-pilot/news/tn-dpt-me-1112-405-demonstration-20161111-story.html
>>A group of 20 women, some sporting messages with the word “unity,” temporarily halted traffic along the 405 Freeway in Costa Mesa on Friday afternoon in a flash mob-style demonstration.
Shortly after noon, the women, wearing red or blue sport bras and shorts, exited about five vehicles on the northbound 405 near the Bristol Street bridge next to South Coast Plaza.<<
And from Thursday night's protest
http://www.latimes.com/local/lanow/la-me-ln-trump-protests-lapd-20161110-story.html
>>Earlier in the day, a group marched onto the 10 Freeway in Boyle Heights but was quickly ushered off by police. The incident forced the closure of the freeway for about 20 minutes.
Still, the crowds were smaller on Thursday than the thousands of people who protested Wednesday. Of those, hundreds flooded the 101 Freeway, one of the main arteries through downtown L.A., blocking traffic and ultimately prompting police to move in.<<
>>City officials said Thursday that they were prepared for more nights of demonstrations and civil disobedience, with their attention focused on the freeways.
“Folks need an avenue by which to express themselves — we want to provide them with that,” LAPD Chief Charlie Beck said in an interview. “But we want them to do it in a lawful manner.”
Those remarks were echoed by Los Angeles Mayor
Eric Garcetti, who told reporters he was proud of the activism he saw Wednesday night. Although the majority of protesters were peaceful, he said, he feared the message could be overshadowed by the unlawful behavior of a few.
“There’s no place for the destruction of property or the dangerous stoppage of traffic in a city where the overall majority of people are exercising in peaceful protest,” he said. “You’re getting in the way of 99% of people’s own message.”
Twenty-eight people were ultimately arrested overnight Wednesday for impeding traffic, police said. Officials said some may also be booked on suspicion of vandalism.
In Wednesday night’s protest, police had initially wanted to intervene as little as possible, Beck said.
“That was our goal,” he said. “To let people exercise their 1st Amendment rights and do so as unaffected by policing as we could possibly do it.”
That changed, however, as protests in L.A. often do, when they reach a freeway. At that point, out of concerns for the safety of the demonstrators, Beck said, the LAPD “had to change our posture dramatically.”
Officers worked with the California Highway Patrol to stop traffic and try to clear the cars already in the area. Then it was time to try to move protesters from the freeway, Beck said.
“That piece of freeway is really tough for us,” the chief said. “There’s like 17 on- and off-ramps in a very, very tight area; there’s a short fence. Four-hundred or 500 people — stopping them from trying to get access is very difficult.”
“It’s going to take a while to get them off,” he added. “We have to make sure we get them off safely.”<<
So hopefully the message delivered will be, you can express your First Amendment Rights, but do so peacefully, law abiding, and be safe, which includes staying off the freeways.