Driving to Northern Cali via the 5 one morning, through an unrelenting sand storm. Visibility was, well, zero, but I'm on the freeway ... so the slowest I deign to drive is 40mph. After about 50 miles of it not letting up, my daughter is so panicked in the back seat (and yeah, I realize we've likely used up our luck in driving that fast with no visibility for that long) - we pull over to the side of the road to ride it out.
It doesn't stop. After an hour, we imagine it's letting up a bit and start driving again, keeping the speed down to 25-30 mph.
Nothing happened to us, but driving that long at even those speeds was scary as all fu ck.
When we reached our destination, we discovered that - about 6 miles behind where we pulled over to stop - a 100+ car pile-up stopped all traffic on the 5 for the rest of the day. We missed that by less than 10 minutes.
Oh, and we had to replace our completely sand-pitted windshield.