New Orleans was partway through replacing its street barriers, leaving a fatal opening

An entrance into the French Quarter, where a driver plowed into pedestrians on New Year's Day.

EMILY KASK/AFP via Getty Images

• A driver killed 15 in a vehicle-ramming attack in New Orleans on New Year's Day.
• Bollards were installed in 2017 to limit vehicle access, but soon after began malfunctioning.
• They were being replaced over New Year's. Police had a makeshift barricade that the attacker drove around.

New Orleans was removing and replacing traffic bollards...