If you think about it, an earth road isn't going to be the main road. It will be the road less traveled. You could call it a path (you know, like a dirt path!) or a dirt road. Alternatively, another less traveled street that would probably be made out of dirt back in the day (before everything was paved) would be an alley. Imagine yourself walking down a dirt alley at night with no shoes. Scary!

This is a jukugo word, which usually means on'yomi readings from the kanji. You've learned these readings already, so you should be able to read this word too! And remember, that it's the じ reading that you learned with 生地 here.