Truly astonishing to see almost all of the elites failing to run the tangents.
Years ago, when Salazar's 1981 world best at New York was disallowed as a record since the course had been measured on the blue line and was a couple of hundred yards short, he claimed his time should stand since he said he ran the blue line. My reaction to that justification was that, if he did indeed run the blue line, he should lose the record for stupidity. I ran that New York and I was totally focused on the tangents - a major factor in Central Park. (Thus Salazar nipped me by a mere 24 minutes instead of 25. Every second counts, especially when you are, as I was, 44 years old.)