The new system puts an end to the Tuesday morning crunch of eligible people calling in and flooding the phones lines -- within minutes -- trying to schedule a vaccine appointment with the health department for available doses. Those age 60 years and older, those age 50 and older with pre-existing medical conditions or those who need transportation assistance to get a vaccine can register with the Suburban Mobility Authority for Regional Transportation (SMART) Bus Macomb Vaccine Registration Line. They then will be contacted by the health department to schedule an appointment when one is available. Seniors can register at smartbus.org/macombvaccine or call the registration line at 586-421-6579.