§ 113.014 VIBRATION CRITERIA.
   Vibration criteria are shown in the FTA Manual. The FTA distinguishes between “frequent” and “infrequent” events. Frequent events are defined as more than 70 vibration events per day. Most commuter rail lines like Metra’s are below 70 events per day and fall into the “infrequent” category.
(Ord. MET 02-25, passed 8-16-2002)