There is no. 16. It stops right in front of 5th Terminal. It takes a while to gets to the city but don't worry. On it's way to the city center it passes red line underground. Just get off at Bu Slim Station (ask the driver he will point you to the right direction). But beware and watch out! Get on the right train. You don't want to end up in Tajura:)
If you fancy some sight seeing, get one bus stop earlier. It's Tripoli central. Take a train to Janzour, then catch any bus going through Gargaresh, fancy shops, restaurants, cafes, pret a porter on sidewalks. If you have only few hours - perfect stop.
Watch out on the weekends. 16 turns into 4 then. It does not stop everyhwere. Take underground for sure. Of course if you want to get to the center you will have to take yellow line, but the signs are quite clear, as usual in Libya. As 4 is a special express line they don't accept your monthly Tripoli Transport Card so be ready to spent extra 50 qirsh.
Anyhow, it's really the best transport experience ever.