Parents in Charles County, Maryland, continue to scramble in an effort to get their kids to school as a labor action by bus drivers stretches into a fourth day.

Over 100 routes are shown as canceled Wednesday morning, according to the Charles County Public Schools website.

Drivers are in the midst of a sickout pressuring the Maryland school district’s administrators for fairer wages.

Drivers plan to continue negotiations over wages and other issues with the school system in mid-November.