ARLINGTON, Va. — The Northern Virginia county of Arlington wants to get people out of their cars and onto bicycles., but the swap is costing millions of dollars — and making traffic more dangerous.

Via a “Complete Streets” initiative, local planners are instituting “sharrows” for cyclists to share roads with motorists.

“The county sees itself as a model for ‘livability and sustainability. In reality, it’s creating unsafe situations,” said Joe Warren, a member of Arlington’s Transportation Advisory Committee.