Refers to a public road or street, often in urban settings. Slightly more formal than 道 (みち) and commonly used in compounds like 街路樹 (street trees).
Many street trees are planted along the avenue.
A new road opened in the city center.
He walked slowly along the quiet street.
Shops line up along the street.
通り is the common, conversational word for a street (often with a name), while 街路 is a more official or written term used in urban planning contexts.
街道 refers to a major highway or route connecting towns, while 街路 refers to an ordinary street within a city; the two share the kanji 街 but differ in scale and setting.
Compound of 街 (town, street) and 路 (road, path). The reading がいろ is the on'yomi for both characters.