I drove along the same road last weekend to the KCA TT. Ride HQ was down at Brenzett but the start line was back up the A2070, and some riders were on their way up when I came through. Because I was observing the 50 limit, drivers behind me were getting impatient, which made me nervous for the riders' safety. Luckily, there were cars coming the other way too, discouraging overtaking.
It's all too easy to see how this incident happened.