road·block 
/ˈroʊdˌblɑ:k/ noun
plural road·blocks /ˈroʊdˌblɑ:k/ noun [count] 1 : a place where police or military officers stop drivers especially in order to examine vehicles 2 US : something that stops progress
▪ That's the one roadblock to the plan. ▪ roadblocks on the path to success
▪ That's the one roadblock to the plan. ▪ roadblocks on the path to success
