My part of Rhode Island is mostly flat with just a few short hills. To ride any hill I have to make a deliberate detour. there is one hill near my house I always ride for the training effort and one very steep hill in an area I need to drive to due to an intervening bridge where cycling is not permitted. I made a protractor-like device to measure slopes as I don't have a good eye to judge. The hill near home is one mile long but mostly 3% to 6% with only an 8% section in the last 50 meters. The one I drive to is 500 meters long and mostly 12% top to bottom. For me, this is very steep and I'm glad it is no longer.