how many hours people spend on stoplight in the USA in a year?
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Hours spent by a person on stoplight in a year in USA:

(Time spent by a person on 1 stoplight) * (Avg number of stoplights faced by a person in one day) * (Number of days in a year)

Time spent by a person on 1 stoplight: 90 secs

Suppose total duration of a stoplight is 120 sec.(30 sec for each lane). First car would get next green signal in 90 secs. Lets not include edge cases like traffic jam etc.

Avg number of stoplights faced by a person in one day: 10.1

Lets breakdown the US population in following buckets:

 Age bracket 0-10 11-20 21-60 61-80 81- Description Babies School/College Working Professional Retirees Aged % of Pop 10% 10% 50% 20% 10% Stoplights facedin one day (Assumptions) 1 3 College:- 2Train Commuters: 4Bus/Car Commuters: 10Stay at Home: 2 3 1 Weighted Average 0.1 0.3 9 0.6 0.1

Avg number of stoplights faced by a person in one day: (0.1+0.3+9+0.6+0.1)=10.1

Hours spent by a person on stoplight in a year in USA:

(Time spent by a person on 1 stoplight) * (Avg number of stoplights faced by a person in one day) * (Number of days in a year)

90sec * 10.1 * 365=331,785 sec

=92 hrs

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