Students must complete the PennDOT Internship Application. Internship applications may be submitted online or mailed to the local Human Resource Office. Please see a list of all PennDOT Human Resource Office locations below. Our preference is that applications are submitted online to expedite the process. Hiring Periods: The majority of internship hiring is in the Summer Program beginning April 1st and ending October 31st. Applications for the summer program will be accepted beginning January 1st through March 30th.