Freeway 
A Freeway is the highest functional class of road. It is designed for higher speeds and limited entrance and exits being the only way to enter or exit this type of road. All roads set this way will be set as a freeway. Note though, having exit and entrance maps doesn't make it a freeway: if it still has entrance points from roads that connect via a stop sign or a 4-way stop light.
Any road with the Functional Class (FC) as freeway will be coded as a Freeway and will be colored blue on the FC map, but also watch for any roads with the FC Principal Arterial that fit the category of having exit and exit ramps only for connections as it may have had un upgrade since the last state map update.
Ramps 
A Ramp will connect two roads together; however, it will not be used for a simple At-grade connector or in other words a road that doesn't have a different elevation level. There are some exceptions to this rule to understand.
Major Highway
A Major Highway will have the FC as Principal Arterial and typically will be colored red on the FC map. You may also find Principal Arterial - Other Freeways (colored in orange on the FC map) if these roads do not fit the standard definition of a Freeway. All US Highways (US-169) will be labeled as a Major Highway regardless of what the FC map shows unless it can be labeled as a freeway.
Minor Highway
A Minor Highway will have the FC as Minor Arterial and will be colored as green on the FC map. Also, all State highways will have a minimum of this level regardless if the FC map indicates it should be a lower classification.
Primary Street 
A Primary Street will be labeled as a Major or Minor Collector on an FC map colored as purple or yellow. Also, pay attention to any paved county road as these will have a minimum of a Primary Street. Also, most frontage roads will have this category as well.
Street 
A Street will be for any road in a town or city (regardless if paved or not) that doesn't fit in the categories above. In rural areas, this will be lightly used for paved roads that cannot be considered a County Road (a rarity in the rural areas).