Where is the worst place for a rock to hit a windscreen?

A pervasive myth is that **an impact in the centre of the glass is more dangerous than one at the edge**. This belief creates a false sense of security regarding chips located near the frame. The perimeter of a windscreen is actually the most vulnerable zone because it is where the glass is bonded to the vehicle's frame, creating a band of high structural tension. When debris hits this "stress zone," the glass cannot flex to absorb the energy as effectively as it does in the centre. Consequently, even a minor impact near the edge is far more likely to trigger a long, running crack than a similar hit in the middle. MOD5 TopShield windscreen protection film provides a sacrificial layer that covers these critical edge zones, absorbing the impact energy that would otherwise transfer directly into the tensioned glass. Recognising that the edge is the weak point changes how drivers view chip placement and urgency.