Traffic has ground to a halt on one direction of a six-lane freeway (three-lanes in each direction). The state Department of Transportation (DOT) reports that it observed from the state patrol helicopter a density of the stopped traffic of 52.8 veh/lane/mi.
What would you expect that the average spacing of vehicles is?

Afan that can provide air speeds up to 60 m/s is to be used in a low-speed wind tunnel with atmospheric air at 35 c. if one wishes to use the wind tunnel to study flat-plate boundary layer behavior up to reynolds numbes of re 10, what is the minimum plate length that should be used? at what distance from the leading edge would transition occur if the critical reynolds nurnber were rer,e = 5 × 105?