How many {highway system} are to/by {controlled-access highway} ?
How many highway systems are there in controlled access highway?
SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P16 wd:Q46622 }
SELECT (COUNT(?sub) AS ?subs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sub .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P16> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q46622 .
} 

What is the number of highway systems are present in a controlled access highway?