Just out of interest, what would you presume the average speed to be around the area of the underpass, and steps from Platform 2.
Not trying to start an arguement here, and I support the fact that the drivers do NOT pay enough attention on this piece of road. However I do think that trying to clamp down on speed legally will be almost pointless.

Due to the curve in the road, how narrow it is, and of course the challenge in crossing the road, the speed of the cars 'appears' excessive, but from experience I would say very few cars are actually exceeding the speed limit.

A refuge in the middle of the road is really a non starter I would think, Due to the width of the road, you are more likely to be struck on said refuge by a car misjudging it. YES the motorist would be in the wrong, but you would still be in hospital or a box.

I have attached an image of our favourite piece of road, taken this morning. Hopefully from this it is possible to see that a centre refuge would not be practical, especially for emergency vehicles and other large vehicles passing. However the length of the road and line of sight WOULD allow for a chicane to be installed. Which would a/ slow traffic, allowing right of way for traffic coming from the south circ to avoid congestion, and b/ create a narrower, slower, 'safer' point to cross the road at. Meanwhile allowing for an emergency vehicle bump free passage.

Even if one was made on a temp basis with water filled red and white barriers, this would test the theory.

A car parked near the cab office last night actually created an improptu chicane, anyone getting off the train about 6.45 might have seen this. The traffic although heavy was a lot calmer.

Who would need approaching about an experimental chicane?

One after thought, hopefully a chicane area would also stop the piece of road being used as a pick-up / drop-off point.