§All geometric elements
must meet or exceed
§Only when constrained by
terrain or development is minimum used
§Maximum safe speed for
worst driver under bad road conditions
§Reaction time of drunk
drivers, stopping with bald tires on slippery road, average
comfort level of blindfolded passengers in 1930 vintage car
§Driver,
environment, vehicle and roadway characteristics govern the operating speed
§Minimum
design speed should be based on functional classification, rural vs urban, terrain, volume and anticipated operating speed based on studies from like facilities