Let me see if I can answer some questions that have been raised.
First, please note: I do traffic, and traffic only, for Total Traffic Network. Cumulus is a different company taking a different approach to its news and traffic by having its Dallas office handle Los Angeles. As has been mentioned by another poster in this thread, TTN has two traffic centers in the Los Angeles metro area.
I work in the Phoenix center, where we cover Las Vegas, Phoenix, Tucson, Albuquerque, El Paso and Salt Lake City. Generally, each of us covers two markets. If a market is experiencing a greater number of incidents, one of us will offer to either help with that market or pick up the slower market to allow focus on the critical situation.
I've lived in Phoenix for 27 years, have been a journalist for more than 30 and have been a traffic reporter and producer for four. My level of experience is not out of sync with many of the people I work with...some of whose reports I've personally relied upon to get to and from places for more than 20 years.
In addition, I've lived in one of the two markets I cover regularly apart from Phoenix and have spent considerable time in and am familiar with the other. And some of my earliest broadcast heroes as a kid and teenager were some of the finest traffic reporters (Captain Max Schumacher, Jim Hicklin, Big John McIlhenny, Bruce Wayne) in radio history.
Not only are the people I work with experienced broadcasters, we don't do this cold. We have resources and we use them. Each workstation has immediate access to a digital file containing local pronouncers, police scanner codes used by authorities in that area and phone numbers where we can reach the authorities to clarify details. We do our homework. We read those, we memorize those and we use those. On the rare occasions when we blow a local pronunciation, we hear about it on the traffic tipline (a local number for each market that we include in most if not all our reports...which rings straight to us)....either from a listener or someone at the station where the report aired.
As for intimate knowledge of the local streets and freeways:
We each have two computer monitors. One is constantly on a map showing traffic volume and speeds for both city streets and freeways, instantly switchable between markets. The other has multiple web browser tabs (data feeds, cameras, etc.). When an accident happens, I switch tabs and pinpoint the incident on Google maps, which also gives me a glance at alternates that are within reasonable distance. I compare that to the other monitor, showing traffic volume and speeds for those alternates and include the best choices in the report. As long as the incident is in effect, I'm double-checking volume and speed on those alternates...and looking for the next move if those look like they're going to approach gridlock. In satellite or street view, I know about school zones and residential areas that aren't going to be helpful. Construction? Already part of the information we have...updated every time they open or close a lane. And that gets factored into recommended alternates, too.
That is also how we address solution-based reporting...and if you think about it, it doesn't require more time on-air. Something like "Crash on the Northbound I-17 at Camelback blocking three lanes with slowing back to Indian School so far. Get off before then, go east to 19th Avenue or west to 27th Avenue, head north and get back on the freeway at Bethany Home...that's the next on-ramp after Camelback."
It's absolutely tougher in L.A....more people, more cars, more streets and freeways, more simultaneous incidents and fewer alternates in some locations due to geography. But again...TTN does L.A. traffic from L.A. and has invested in not one but two broadcast centers in the Los Angeles area.
Reading some of the comments, you'd think we all did one shift, went home and were replaced by a first-timer every day from then on. We study, we learn, we remember and we build on our experience and knowledge. There is only one first day. And the people I work with are pros enough to get that first day darn near perfect, as we've all done for the radio and TV stations in many markets we've worked for throughout our careers.