The Pennsylvania Turnpike is warning that some 10,500-plus drivers who combined owe more than $17.1 million in unpaid invoices and violations could have their vehicle registrations suspended if they do not pay before Aug. 4.

The suspensions are possible under legislation passed last year and the turnpike is targeting drivers with six or more outstanding toll invoices or violations. The law takes affect next month, and drivers who pay now can have additional fees waived through the turnpike's partial-amnesty program.

The turnpike said multiple letters, notices and invoices have been mailed to those who are in danger of having their vehicle registrations suspended.

For more information regarding the program, or to check to see if you have any unpaid violations, visit www.PATurnpike.com/violationenforcement, or to pay, call 1-877-736-6727.