Driving to Gatwick is straightforward via the M23. Exit at Junction 9 and follow airport signs

https://www.scribd.com/document/1077066259/Heathrow-to-Gatwick-Airport-Transfers-Coach-Taxi-or-Train-174457

Driving to Gatwick is straightforward via the M23. Exit at Junction 9 and follow airport signs. Allow extra time for peak traffic and plan parking in advance to secure better rates.