Use terminal maps to plan your drop-off or pick-up point; some ride-hailing apps designate specific zones

https://telegra.ph/Getting-to-Heathrow-from-Stansted-Train-Coach-and-Car-Options-08-17-2

Use terminal maps to plan your drop-off or pick-up point; some ride-hailing apps designate specific zones, and short-stay car parks are signed clearly.