Vehicular traffic analysis - PA
Hello,
Please can someone please clarify why answer B is the correct one? this is from the free NCARB PA exam
thank you!
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The shop is only open until noontime, so that immediately eliminates looking at the second diagram for 5pm. The shop has a drive thru on Main Blvd, so that narrows it to only looking at the numbers passing by A, B or C on Main Blvd (not 1st, 2nd, 3rd or 4th). Furthermore, because of median, you should only look at numbers on Main Blvd that occur on same side as the building. A has 258+100 turning from 1st=358.I assume we don't consider the 221 as additional because the number occurs downstream beyond the location of A. C has 97. I again assume we don't consider any of the upstream straight travel numbers because those occur at intersections before the building and thus could've turned onto side streets before reaching C. B has 597 (and per the official answer 54 additional coming from 3rd=651). I found the location of numbers on the plan ambiguous in meaning/relationship to the road segments and the methodology unclear. It seems we aren't supposed to figure out what numbers didn't turn upstream of C and instead trickled through going straight in addition to the 97?
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Hi Sean,
Thank you for your answer. I agree the numbers and arrows are quite confusing.
Thank you for pointing out we should only focus on the 8am diagram. I was in a rush when answering this question and didn't realise it was open till 12pm not 12am so i was looking at both diagrams actually.
Focusing only on the 8am diagram - perhaps the only numbers we should focus on are the ones that are on the same side of the building, when the arrow is straight and/or when the traffic is turning right not left?
A: 258
B: 597
C: 436 + 97 = 533
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