Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE Delivery_Routes (route_name VARCHAR, route_id VARCHAR); CREATE TABLE Delivery_Route_Locations (route_id VARCHAR)
### Question:
Find the name of route that has the highest number of deliveries.
### Answer:
SELECT t1.route_name FROM Delivery_Routes AS t1 JOIN Delivery_Route_Locations AS t2 ON t1.route_id = t2.route_id GROUP BY t1.route_id ORDER BY COUNT(*) DESC LIMIT 1