The point about the spacing between turn signal lights is a good one. But it can be aided with light colours and a centre reference. For example, use yellow for turn signals and have a red running or running/brake light in the centre to give orientation and clarity of function to the turn signal light. For front turn signals the headlight provides the visible position reference. In this example, I have the 4-way flashers on...
https://www.youtube.com/watch?v=c5d0...AewYcL2JS3bdoA