Filter by specialization

When retrieving a list over association it’s needed regurarly to filter the list by a specific specialization. 

For example, in below domain model, I would want to retrieve all cars of a specific owner over association.

• Currently I would need to retrieve all, iterate through all vehicles, do an object type decision and add the item of object type car to a list. 
• What i would like to do is simply filter the list of vehicles with object type Car.  Ideally the output would be a Car (so including the Cast), but a list of vehilces of type Car would already great.