The only time that I am at this particular stop-light in the turn lane is immediately after I wash my car (get all water out of crevices). Every time I stop here at the red light, my C280 idle's roughly. Not jumpy or anything, just merely a rough idle. I always thought that it had something (?) to do with having just washed my car, until....
I was with my friend Lulu in her C230k at this stoplight, and her idle got rough @ the place (turn lane @ red light).

My question... is there a magnetic field or anything of the sort that can cause weird symptoms on cars, as I described??

It's so weird!

Thanks in advance!

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)

David,

Is there a crop circle near this traffic light?

Have a great day,

they are switching from the kind of traffic sensors which are buried in slots in the pavement to some sort of radar or laser devices mounted up on the horizontal traffic light supports to tell the light's computer whether there is anyone waiting in each of the lanes in each direction (some people have been mistaking them for red light runner cameras, but that's not what they are). I wonder if they could be sending microwaves which might confuse your computer or your crank sensor? I do get nervous about being microwaved every time I stop at a light, but they certainly can't affect my '85 300TD.

Do you see any small tubes on the lights? They look like those cameras on race cars on TV.