Wide angle from down low with the sun from behind. as an example, also if it was a particularly overcast day and I wanted a shot with a big depth of field. I do personally prefer a higher ISO but sometimes it just doesn't produce the image I would like.
As a cyclist and Time Trialler myself I am all to aware that the roads can't be closed, especially with the amount of time trials that happen in my part of the world. Road Races at club level have a certain amount of closure, much the same as a 'Pro' race.
What I meant is that when doing a time trial, to a degree, the cyclists will know at least one person will be taking photos, so are almost ready for it but passing motorists won't realize there could potentially be flashes. Therefore, startling them.
I think for now I will hone my skills with higher ISO
What would you use a flash for? How often can you be close enough that the flash makes any difference without distracting the athletes? High ISO is your friend.
What do you mean in the last sentence? Testing at club level or small meets are not run on closed roads as it is impossible to get permission to close the road.