The riders were clearly speeding, but the Merc driver should have seen them.
It started pulling in front of the riders when they were less than 100 meters from the car - well within viewing distance. Given the intersection style, the driver only needs to check a single direction of traffic - the one they're coming from.
The riders did somewhat try and avoid the car - but they likely initially thought that the car wouldn't pull in front of them, or would only slowly roll to go behind them. The riders did start to move to the right to try and go in front of the car, but the driver kept going and hit them.
My quick notes:
1. Driver turning left is always at fault, regardless of oncoming traffic speed.
2. Riders are going beyond the speed limit, but I wouldn't say they were going crazy fast.
3. Driver pulls into oncoming traffic while bikes are ~100m away
4. Bikes try and swerve, thinking the driver will stop, but they don't.
I don't know if people realize what sort of vision standards there are for people driving. It's a Merc, so I'm going to make the assumption that they're old. There are no standards for testing vision in drivers after they have their full G license, until they are 85 (?). If they don't go for regular eye exams, or wear their glasses like they should, their vision could be frighteningly low. They were quite possibly looking at the bikes and didn't see them. Really, I believe if the driver were paying attention, they wouldn't have pulled out in traffic - it was a wide open view.
actually every time you go to renew your license they check your vision