Cities of Refuge: Required to Be: Easy of Access
Source: TTT
Deuteronomy 19:3
You are to build roads for yourselves and divide into three regions the land that the LORD your God is giving you as an inheritance, so that any manslayer can flee to these cities.
Isaiah 62:10
Go out, go out through the gates; prepare the way for the people! Build it up, build up the highway; clear away the stones; raise a banner for the nations!