To set a stop along a route, for example, for a pickup or dropoff, you designate a waypoint as
a stopover waypoint. To do this, use the vehicleStopover property of a waypoint.
This setting ensures that the calculated route doesn't begin or end on a road that is unsuitable
for pickup and drop-off, such as a highway or tunnel.
Consider the situation where a surface road crosses over a road inside a tunnel. If you were to specify a waypoint located where the two roads intersect (as seen on a map), then the resulting route would begin or end on either the surface road or the tunnel. This result presents a problem because you can't stop in tunnels to make pickups or drop-offs.
If you want to use the waypoint for a pickup or drop-off, then you can set the
vehicleStopover field to true to ensure that the resulting route
begins or ends on a road that allows pickups and drop-offs.
The following example request shows how to set a stopover waypoint:
const routeRequestWithIntermediates = { origin: 'Mountain View, CA', destination: 'San Francisco, CA', travelMode: 'DRIVING', intermediates: [ {location: 'San Mateo, CA'}, {location: 'Half Moon Bay, CA', vehicleStopover: true} ], fields: ['path', 'legs'], };