Thank you for contacting us. We are sorry to read about the damage caused to your property. For further assistance from us, please contact us with your information via a Private Message or Direct Message on one of our social channels: Facebook @UPS or Twitter @UPS.
Sounds like your driveway is saturated with water, and muddy, under your gravel. It happens this time of year, especially when the ground freezes, and thaws.
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