42-425 - Special provisions applying along district boundaries LAST AMENDED 6/6/2024 Whenever an M2 or M3 District adjoins a #Residence District#, the #steady state# and #impact vibration# displacement, measured at the district boundary, shall not exceed the maximum permitted for an M1 District for the #frequencies# as set forth in the tables in Section 42-423 (Maximum permitted steady state vibration displacement) or Section 42-424 (Maximum permitted impact vibration displacement).