関連ワード:  what is the longest route in the united states    what is the longest us route in the united states    what is the longest drivable route in the united states    what is the longest train route in the united states    what is the oldest road in the us    oldest route in us    when was us route 1 built    which us city is the oldest    where does us route 60 start and end  
結果 : what is the oldest route in the united states