I try to keep as large a distance as possible, but I prefer to close up gaps to match those of everyone else when driving my daily drive into work on NSL SC (which moves at around 40mph in dense rush hour traffic).
In heavy traffic what kept happening (and still does, but to others now) was that people waiting to enter the road just go when they see a gap larger than usual (whether or not it is big
enough is irrelevant).
I got thoroughly annoyed on several occassions, but on in particular stands out as memorable.
Approaching a T-junction (enters the main road from my left), the SC widens to accomodate a middle lane for turning right from the opposite direction. A car is waiting to turn right. I am in the amongst heavy traffic in front and behind on the main road.
A queue is waiting to pull out from the left. Stupid me left 2-3 seconds rather than everyone else's 1 second gap.
What happened? As the car in front of me passed the junction not one but TWO of the b*st*rds pulled out. With zero chance of stopping and no escape route left (it would have written my car off going through a large fence and down into a field - they would have f*cked off and I'd have been left to pay for everything

) so I went right. Far right. Around the car waiting to turn right!
As another car approached from the other direction I had to pull sharply back into my original lane, which inconvenienced the guy who tried to kill me causing him to flash his lights and beep his horn.
He's lucky he's still alive. I was ready to follow him to his destination and kick his head in, but fortunately calmed down eventually.
Now I leave minimal gaps in heavy traffic on the basis that I'd rather have a lightish shunt than the sort of collision that these pricks would inflict on me.