I'm an occasional storm chaser, definitely not a meteorologist. I've been chasing a couple times, and I've only seen one traffic jam, which was mildly stupid, not terribly dangerous, and composed of about two thirds recreational chasers, one third more science-y looking types.
For the most part, when people are out there, they seem to have good attitudes, but in both the chaser and science communities there are some big, terrible egos that really have little tolerance for people who aren't doing the exact same thing the exact same way they are. But that's just whining, that's not the real problem.
The real problem is common sense, which is ever slightly less uncommon with the science crowd than with the recreation crowd. Both are capable of blocking roads, impeding traffic, and being a general nuisance. Again, the recreation crowd is slightly worse at this because there are slightly more people proportionally in that crowd that lack appreciation for their surroundings due to overexcited-ness and some of them just being silly kids and/or hillbillies out looking for fun. That said, some people who think they are big shots because they're "scientists", and the world should get out of their way, and the same problems emerge.
So, to the scientist community, I say, complaining about chasers is NOT the answer to your difficulties. Cooperation and education ARE answers (though imperfect as there will always be some yahoos out there being stupid). Sure, the science community has the best tools out there for doing legitimate research, but they're usually slow groups and many participants don't have the skill or experience to get to areas of interest like many of the best chasers do. If chasers were utilized as a scouting tool by Vortex and other search entities, given proper chasing protocols, and for those who show they're responsible enough, some actual data acquisition tools, Vortex could have a lot more success and everyone could be happier and have a good time too. Many chasers are really just a lot better at getting to storms (safely), than the researchers, it's just a fact (of course, it's also a fact that a lot of inexperienced chasers suck, but whatever, hopefully they can at least have positive examples on how to conduct themselves safely and respectfully). I mean, he may be a complete spaz that rubs a lot of people the wrong way, but Reed Timmer and crew have a LOT more success getting to tornadoes than any researchers. There are a lot of other chasers out there who are also very good and if treated with respect would be quite happy to aid in a research project.

In other words, CAN'T WE ALL JUST GET ALONG?! (it's better than whining behind each other's backs, we don't want this to start being like that awful Twister movie).