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_29 ( nbr_number INTEGER, class VARCHAR, road_number VARCHAR )

### Question ###
What is the highest NBR number that corresponds to the J class and the road number of 1211?

### Accurate SQL ###

SELECT MAX(nbr_number) FROM table_name_29 WHERE class = "j" AND road_number = 1211