text: Limiting car usage would be beneficial implication for carbon emissions and the enviroment. Greenhouse gas emission would reduce to 12. Car free day everyone should have a car free day including in america everywhere. Car free day is when you hike,biked,skateboard or just take the bus to work. Car free day is to promote alternative transportation and reduce smog. Limiting car usage lower air pollution. Cold nights and warm days cause the warmer layer of air to trap car emisssions.