Main Road
Highroad
noun
A street road is as wide as a street and a road combined together. So cool! So wide! It must be a main road or a highroad!
Keep in mind 街道 isn't a generic term for main roads. It usually refers to important routes that connect different regions of Japan, especially those from the Edo period, like 日光街道 (Nikkōkaidō) and 中山道 (Nakasendō). But it can also refer to main roads with historical significance in other countries, like アッピア街道 (the Appian Way) in Italy or オックスフォード街道 (Oxford Street) in the UK.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. One thing to note though:
This word uses the かい reading for 街 (not がい). And even when 街道 is a suffix, it never gets rendaku'd! Remember this by imagining every main road being full of kayaks (かい) for some reason. Just a traffic jam of kayaks up and down the 街道.
この並木街道は私のいこいの場です。
This main road with a row of trees is my relaxation spot.
この街道をずっとまっすぐ行くと、そのうち京都に着きますよ。
If you take this highway straight for a while, you will eventually arrive at Kyoto.
僕は街道を自転車で旅して、日本各地を回っています。
I'm traveling by bike along the highways, visiting various places across Japan.
東海道、中山道、日光街道、甲州街道、奥州街道は、五街道と呼ばれ、江戸時代の五大陸上交通路であった。
Tokai-do Road, Nakasen-do Road, Nikko-kaido Road, Koshu-kaido Road, and Oshu-kaido Road are called Gokaido, which were the five principal routes used during the Edo period.