3QUESTION 3 OF 3
Answer & explanation
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
2,900
signalized intersections
How to estimate it
Fermi’s official “Napkin math”
No single number to grab, so use the grid. The streets run up past 200th, and there are about a dozen avenues crossing them. Most of those corners have a light.
- Cross streets
- ~220
- Avenues across
- × 12
- 220 × 12
- ≈ 2,600
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- NYC signalized intersections (DOT, 2022)
- ≈ 13,540
- Manhattan share
- ~21%
- Manhattan total
- ≈ 2,900
Reference cited by Fermi: NYC Department of Transportation (2022: 13,543 signalized intersections citywide, 2,862 of them in Manhattan)
How close was your guess?
Your comparison will appear here.
Compare by ratio: divide the larger number by the smaller one. The closer to 1×, the better.