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 table_name_23 ( avg_speed VARCHAR, distance VARCHAR, winning_driver VARCHAR )

### Question ###
What was the average speed over 18.00km for winning driver Jean-Claude Andruet?

### Accurate SQL ###

SELECT avg_speed FROM table_name_23 WHERE distance = "18.00km" AND winning_driver = "jean-claude andruet"