>>Isn’t the allowable distance to walk on Sabbath considerably less than 19 miles?
Doubtless there are people that spend hours debating and researching this stuff.
http://www.askmoses.com/en/article/208,146/How-far-am-I-allowed-to-walk-on-Shabbat.html
Perhaps a knowledgeable person on the subject will join in - I’m not in that category!
Gee I learned a new site Askmoses.