Segments and Nodes
What is a segment?
In geometry, a line segment is a part of a line that is bounded by two end points.
In the Waze map editor, Cartouche, we use segments in order to draw new roads, as the definition above explained, that segment has to be bounded by two end points, what we call a Node.
Types of segments (Highways)
Highways
In the US we can find diferent types of highways, we set the segment according to the road size.
Freeway 
A freeway is a highway with separated lanes, and without traffic lights or stop signs.
Only interchanges (ramps) and other types of highwats are used for entering or exiting a freeway.
Roads such as streets, primary streets etc. can't be connected.
Major Highway 
Major highways have two one way roads, their access and exits could be a ramp or a junction.
In the picture you can see a combination of both: some of the turns are controlled by traffic lights and some are by ramps.
