 an APC or perhaps a truck towing a howitzer) following in the tracks of the first tank drives over it – an event which might occur seconds, hours or even weeks later.The M608 double-impulse fuze is particularly useful when fitted to mines located on the outer edges of minefields, because this gives tanks a false sense of security.The lead tank, for instance, can drive over 30 mines fitted with double-impulse fuzes without detonating any of them.