Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE Delivery_Routes ( route_name VARCHAR, route_id VARCHAR )
TABLE: CREATE TABLE Delivery_Route_Locations ( route_id VARCHAR )

### Question ###
Find the name of route that has the highest number of deliveries.

### Accurate SQL ###

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