But the tire speed rating system isnât without its quirks. For instance, the systemâs European roots give it unusual mile per hour maximums. Another such quirk is that the letter âHâ is out of place. Instead of appearing after âG,â it falls between âUâ and âVâ as does the speed to which it corresponds.
Among them: 1  RNs tend to have more responsibilities and independence in the workplace than LPNs. 2  RNs must usually complete more training than LPNs. 3  LPNs are in higher demand than RNs, nationally speaking.  RNs tend to earn more than LPNs.
Differences Between RNs and NPs. The big difference between RNs and NPs is the degree of autonomy an NP is granted. While NPs are required to work under the auspices of a physician, in many states, NPs may diagnose and treat patients in an independent location, without the constant vigilance of a physician.