I visualized my 8.7mi route and wrote down my step by step route, then added up totals:
-25 intersections
-10 of them with stop lights
-10 of them with stop signs (3 of those 10 are 4-way stops)
-The remaining 5 intersections don't require a stop (i.e. right or left turn from main to side street)
-7 of the 25 intersections are right turns so my stop time is only determined if there is x-traffic
Of the 226 times I have recorded my time on this route I have spent on average 3min 36sec stopped at these intersections which adds an additional 12% duration to my commute as a result of being at a stand still, plus an the additional unquantified lost time that is not recorded due to slow down and speed up.
Al