# Calculate reverse direction isoline routing

This tutorial calculates an isoline in the reverse direction. The result is the answer to the question: from where can I get to the destination within a given range? This can be useful when determining which vehicles from a fleet of vehicles, such as a taxi service, can get to the destination within a given time. To trigger calculation in reverse direction, use the destination parameter instead of origin.

curl -X GET \
'https://isoline.router.hereapi.com/v8/isolines?transportMode=car&destination=52.51578,13.37749&range[type]=time&range[values]=600'