G = nx.Graph()   # or DiGraph, MultiGraph, MultiDiGraph, etc
roadWeight = 4
i=1
# Nodes for road vertices
G.add_node("v11",pos=(0,0))
G.add_node("v21",pos=(1,0))
G.add_node("v31",pos=(2,0))
G.add_node("v41",pos=(3,0))

# "Road Objects"
G.add_node("r21",pos=(0.5,0))
G.add_node("r31",pos=(1.5,0))

G.add_node("B",weight=5, pos=(1.5,0.25))
G.add_edge("v11","r21",weight=4, roadName='a', color='blue')
G.add_edge("r21","v21",weight=4, roadName='a')
pos=nx.get_node_attributes(G,'pos')
nx.draw(G,pos,  with_labels = True, edge_color='r')
edgeLabels = nx.get_edge_attributes(G,'weight')
roadLabels = nx.get_edge_attributes(G,'roadName')
print(edgeLabels)
#nx.draw_networkx_edge_labels(G,pos=pos, edge_labels=edgeLabels)
nx.draw_networkx_edge_labels(G,pos=pos, edge_labels=roadLabels)

# nx.draw_networkx_labels(G,pos,labels,font_size=16)