Same for walking- in many towns there is no sidewalk which forces anyone walking onto the gutter. For bike trails, there is an effort to connect Maine to Flori

Same for walking- in many towns there is no sidewalk which forces anyone walking onto the gutter. For bike trails, there is an effort to connect Maine to Florida called the East Coast Greenway: https://www.greenway.org/ https://www.greenway.org/ Having used it myself, it's not continuous but certainly better than nothing.