Enough with the left lane stuff mark, that is just stupid to assume most folks here are like your boss.
dre, looks like 60 legal to me for unposted minimum on a hiway, any less than that and you have to legally be in the right lane, but there is no lower limit that I can see. Might want to talk to someones supervisor.
http://www.nhtsa.dot.gov/people/inju...oc/laspeed.pdf
Minimum Speed Limit:
I. No person shall operate a motor vehicle at a such a slow speed as to impede the normal and reasonable movement of traffic. '32:64(B)
II. A person, who is operating a motor vehicle on a multilane highway at less than the normal speed of traffic, shall drive in the right-hand lane then available for traffic. '32:71(B)(1)
III. A person, who is operating a motor vehicle on a multilane highway at a speed slower than 10 MPH than the posted speed limit, shall drive in the right hand lane than available for traffic or as close as practicable to the right hand curb or edge of the roadway. '32:71(B)(2)
Posted (Minimum) Speed Limit: Base on engineering and traffic investigations, the State may establish a minimum speed limit on any highway. '32:63(B)