What about traffic ratings?

The Schier Great Basin series interceptors are all available with traffic rated manhole covers.
They are standard on both the GB-75 and the GB-250 (the most popular outdoor models).

 

Traffic Rated cover and frame passes
AASHTO #M306 for H-20/HS-20 loading
(40,000 pound load)

 

CLICK HERE to see a brief video clip.
In this clip, traffic loading is simulated by
using a hydraullic press and applying 60,000
pounds of force to a Great Basin Traffic Rated lid.