Badges were big in the late seventies. Many of the skateparks in both the UK and USA operated a badge system either as a sign of membership or as a sign of proficiency. Skate City in London, one of the first UK skateparks took their lead from the ski slopes: Green - Learner slope, Blue - Beginner slope, Red - Intermediate slope and Black - Expert slope.
Skate City - London
Skate City in Tooley Street, London - see Skateboard Issue 2. The park operated a badge system, a beginners green badge got you into the freestyle area and only after being tested by a marshall could you move up to the the bowls; blue for the Slalom run & bowl, then intermediate red bowl and the infamous black bowl.
California Skateboard Scene
California Skateboard Scene was an indoor and outdoor park at the legendary Cali Ballroom in Whipsnade Road, Dunstable, Bedfordshire.
The outdoor park opened on July 9th 1978 with Legs & Co dressed as Smurfs!
The legend that was the the Rom was built in 1978 and on the 11th Sep 2014 was made a Grade II listed site. Sadly it closed it's doors on the 1st September 2019.
Check out the documentary here - Rom Boys: 40 Years of Rad
Skateboard USA Skatepark Warren Michigan
"Skateboard City - located in Warren, Michigan. This was the first good park. They lacked good vertical terrain but the place was loaded with some really nice bowls and a couple of excellent snake runs. After a couple of seasons, some rising competition out of the east forced revision.
I don't remember if ownership changed or not but the name of the park was changed from Skateboard City to Skateboard USA and they added two pools. Both pools were very deep and pretty difficult to ride (not for the faint of heart) but the real experts seemed to like the challenge.
Many a good contest was held here and during one summer's contest, the park was visited by some of the big guns from the west like Tony Alva, Fred Blood, and Steve Olson."