Function tripOpen

tripOpen(json?): void
Open / load a previously saved trip. You can optionally merge trips together.
Parameters
- json: {
  merge: boolean;
  trip: string;
  } = ...
  - merge: boolean
    boolean: If true, merge the new trip with an existing trip.
    If false, remove all existing routes, markers, and tracks before loading the new trip.
  - trip: string
    string: the id of the trip to open. This can be either a private or a public trip id.
Returns void
Example
```
// Open "Seattle to Hawaii, 2 routes"
{"trip":"7k3ykq39","merge":false}
```