Maybe we should ask who uses the stretch of road on the N1 between Malibongwe and Rivonia on a daily basis and does not use the right shoulder. I would be interested to hear their reasoning.
Here's one.
I do that stretch often from 14th to Rivonia or William Nicol, going to Sandton. Sometimes I go to Midrand as well. I used to commute from PTA to JHB CBD for 2 years so, depending on your point of view, I guess I have enough experience to comment.
For one, it has little to do with it being illegal., although it plays a part. I know there are lots of illegal stuff going on, we all do illegal things while driving anyway. (Speeding, not stopping at a stop sign, overtaking on solid line etc etc)
For me it's about risk assessment. If you look at the stats that have been mentioned here, it is simply too risky. End of story. Punctured tyre is a PITA, but not nearly as bad as hitting a car at 80 higher.
I am well used to lane splitting and can "read" the drivers (most of the time anyway. There are always a few that teaches you a new trick every now and then...) I also agree that in general cars get used to lane splitting bikes and make way for them.
I know how long it takes me to get from Roodepoort to Sandton on the bike (lane splitting) so I plan my trip accordingly. Even if traffic is at a standstill I continue splitting because I'm not in a hurry to get there. (proper planning you see....) I have absolutely no inclination to even try out that lane. You can call me a banggat all day long, at the end of the day it's about minimizing risk. It's the same approach I take when I fly myself around in a small airplane.
To those that use THAT lane, be honest, do you really keep to a 'sane' speed to make sure you can avoid a car that jumps into that lane? My observations indicate that most guys really cane it through there!
I've had my fare share of close calls. (mostly doing the PTA - JHB route) I had one experience where I was pretty much next to a car where he kept changing lanes right in front of me. There was space for me to move to - the space he was going into - and I avoided hitting him. (Makes sense no?) In THAT lane, you literally have nowhere to go if a car does that.
Just my opinion. Clearly I'm not part of the 80% (more like 95%) majority. Suites me just fine.