View source for Template:The logic behind road numbers

It is helpful to know the logic behind road numbers because this logic can help you navigate when you are sort of lost.

Major roads that circumscribe a city have three digits. Thus, 495 circumscribes Boston.

Major roads that run east/west have an even number. Thus, 2 runs from Boston out through Williamstown and beyond. Similiarly, 66 runs horizontally across the country.

Major roads that run north/south have an odd number. Thus, 95 runs from Montreal down to Florida.

So, if you ever find yourself completely lost, you can sort of navigate by the road number. Sort of.