I don't know for sure how long the coast is but it's loooong
. I live in the Rocky Mountains and the longest coast is when going over Highwood pass, the top of the pass is over 7000ft I would estimate the longest EOC is 5 - 10 miles. The most frequent long coast I encounter is about 3 miles long, and is quit steep, if I start at the top at 30 mph I can EOC to over 80 mph
before I have to brake for the 30mph zone at the bottom of the hill! Talk about a soap box derby!
