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 bracket0-1011-2021-6061-8081-
DescriptionBabiesSchool/CollegeWorking ProfessionalRetireesAged
% of Pop10%10%50%20%10%
Stoplights faced
in one day (Assumptions)
13College:- 2
Train Commuters: 4
Bus/Car Commuters: 10
Stay at Home: 2
31
Weighted Average0.10.390.60.1

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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