Table:
text: List of numbered Brooklyn streets
Streets
Streets
Street West East _of_lanes Traffic_direction
11th Street 2nd Avenue Prospect Park West 1 West
12th Street Dead-end at Hamilton Place Prospect Park West 1 East
13th Street Hamilton Place Prospect Park West 1 West
14th Street Hamilton Place Prospect Park West 1 East
15th Street Hamilton Avenue Bartel Pritchard Square at Prospect Park West 1 West
16th Street Hamilton Avenue Prospect Park Southwest 1 Varies
17th Street Sunset Industrial Park Terrace Place 1 East
18th Street Sunset Industrial Park Vanderbilt Street 1 West
19th Street Sunset Industrial Park Vanderbilt Street 1 East
20th Street Sunset Industrial Park Vanderbilt 1-2 Varies
21st Street Dead-end at 3rd Avenue 7th Avenue 1 East

Question: From the list of numbered streets in Brooklyn, what is the number of lanes on 20th street?