Today at approximately 630 pm a CALS unit was traveling south on Rt-4 in the St- Leonard area when they heard A79 "call in" a crash at Rt-4 and Ball Rd. Being in the area the CALS unit added themselves to the call and arrived along with other units from St-Leonard VFD already on scene. Medics from CALS assessed the patients with the assistance of BLS crews from St -Leonard VFD and transported ultimately ended up transporting 1 patient to a local trauma center.