[1] Prior to Formula One boycotting and then cancelling the 1969 Belgian Grand Prix because of the dangers of the ultra-high speed 8.7 mi (14.1 km) Spa-Francorchamps circuit, the track was fitted with Armco barriers in some places and was generally made safer.
Spa was the fastest circuit in Europe at that time, and the great mental challenge of this legendary Belgian circuit in those days was that every corner was just as important as the other- if a driver lifted even just a little bit through any of the high-speed bends, they would lose 2–3 seconds from their lap time, just from having done the slightest little motion that would affect how they were driving.
And worse- if a driver made even the slightest mistake, they were very likely to have a huge, catastrophic high speed accident which in those safety-absent days almost always meant serious injury or death.
The Ferrari was unstable at medium speed; the Porsches shredded their tires at the very fast bends.
But towards the end of his double stint, he got a message from the pits: an arrow was shown, meaning he was told to speed up and catch the Ferrari.
That day Surtees had, apparently, difficulty to deal with traffic and Redman had a very good stint.
After some very exciting laps, Redman went ahead, Rodriguez came close, but he had to pit and later Kinnunen abandoned (gearbox).
Some of the top drivers in the world at the time were battling with each other (Siffert, Ickx, Rodriguez, Redman, Elford) at the most fearsomely fast circuit in Europe, and there was a Ferrari-Porsche confrontation.