Biking paths in Boston can be narrow, close to busy roads and devoid of protective barriers. To solve this issue, LivableStreets Alliance is striving to create 200 miles of shared-use “greenway” bike paths in the city by 2030.

“You’re always so laid back about things,” my mom pouts as my brother kicks his feet back and continues glaring at the TV screen. “You’re 25 years old, when will you become more responsible?” This...