I grew up in St. Petersburg, Florida. I can easily remember about 1960 when I was about 10 riding in a car on US Hwy 19 headed to Clearwater. We would travel on wide-open spaces like out in the country without seeing a building for miles. Finally after about 20 miles we saw a small highway sign that said, Courtney Campell Causeway Tampa with an arrow pointing to the right and an arrow pointing to the left that said "Clearwater Beach".
Today, this is US 19 & Hwy 60, and Hwy 19 continues like this for 60 miles until you reach Spring Hill and then it finally starts to thin out until you reach Crystal River.