If the thought of not knowing how long you could end up waiting at the emergency room leaves you nervous, one New Jersey hospital has a solution.

Bayonne Medical Center in Bayonne, N.J., has unveiled two electronic billboards Tuesday, which show up-to-date wait times for their emergency room service—from walking in the door to seeing a doctor.

The billboards are located in Jersey City's Journal Square and on the New Jersey Turnpike near the Holland Tunnel.

The hospital claims patients, on average, wait less than 30 minutes.

The Associated Press contributed to this report.