assign model values of type collection in ddd

Im having a hard time trying to find whats best for assigning a value of type collection to the model, to be more explicit here is an example of the issue.

lets say that you have a map entity that have a property named routes that accept a collection holds objects of type route, what will be the best way to assign the routes to the map.

A :

public function setRoutes(\route $routes)
{
    // routes of type collection
    $this->routes->push($route);
}

B :

public function setRoutes(\routesCollection $routes)
{
    $this->routes = routes;
}

what will be the best way, and why in a ddd enviroment?