# Network Elements#

## Junctions#

Junctions, (also referred to as *Nodes*), represent intersections. A SUMO junction is equivalent to a Vertex in graph theory.

Example of different junctions

## Edges#

In the SUMO-context, edges represent roads or streets. Note that edges are unidirectional. It's equivalent to a edge in a graph theory.

Example of edge. Note that the box "select edge" is **checked**

## Lanes#

Each SUMO edge is composed of a set of lanes (At least one).

Example of lane. Note that the box "select edge" is **unchecked**

## Connections#

Connections describe how incoming and outgoing edges of junctions are connected (for example to prohibit left-turns at some junctions.

Example of connection between a source lane and a target lane

## Traffic Lights#

A traffic light program defines the phases of a traffic light.

Example of Traffic light