Question

1. What is the correct order of magnitude of each of the following U.S. national-level data items? Feel free to use any professional source - including any that you've already used in a prior homework -- to help you answer this question. Data may come from different years, so please use the most recent one you can find. You won't need to cite the source or the year. No need for a narrative. See "Number of transit buses" for an example. Data Item (for United States) Number of motor buses Order of Magnitude 104 Data Item (for United States) Order of Magnitude Total railroad capital expenditures Class I railroad miles Vehicle miles of travel Average walking speed (ft/s) Number of public use airports Miles of collector roadway Unlinked transit passenger trips Number of Amtrak locomotives Number of registered vehicles Passengers using Amtrak's busiest station Number of highway bridges Weekday morning headway of bus on Route 66 (min) Maximum capacity of a megaship (in twenty-foot equivalent units) Airline revenue passenger-miles Miles of navigable waterway

Answer 1

Data item	Order of magnitude
Number of motor buses	104
Class 1 railroad miles	93058
Average walking speed (ft/s)	5
Miles of collector roadway	315574
Number of amtrak locomotives	436
Number of registered vehicles	272.48 million
Airline revenue passenger- miles	80.5 million
Miles of navigable waterway	25000
Total railroad capital expenditures	3.57 billion dollars
Vehicle miles of travel	3.18323 trillion
Number of public use airports	5087
Unlinked transit passenger trips	9.89 billion
Passengers using Amtrak's busiest station	650000
Number of highway bridges	600000
Weekday morning headway of bus on route 66(min)	23
Maximum capacity of a megaship (in twenty-foot equivalent units)	21100