When a Vehicle lays Pattern Mines in an Engagement they place a Face Down Marker for the Mines, this remains in place until a Vehicle or Character causes them to Detonate, when this happen the Marker is flipped to reveal the Mine, if the Vehicle that lays it wishes they may instead have placed a Dummy Marker which causes no damage but does not cost a Shot from the Vehicles Mine Layer, this allows the Vehicle to Fake laying Mines that could be simple Dummies, or even just some Debris on the Highway.
Dummy Mines[]
When a Marker is revealed to be a Dummy the Vehicle or Character than revealed the Marker can remove it from play without any Damage resulting from the Marker, if a Character is On Foot and within 2cm of a Mine Marker they may make a Complex Action to determine if the Marker is a Mine or a Dummy, this allows the Character to examine the Marker, though they need not reveal it to other players.