Webpage with Google Map API

Webpage with google maps API. User uploads Json file. Jason files has Start city and End City. When user click Draw Routes, it works as follows:

1- Create Route between Start city and End City. Each Route is different color.
2- Create Marker A at Start City and Marker B at End City
3- Create arrows on Route to show direction
4- Toggle button to Show/hide Markers A
5- Toggle button to Show/hide Markers B
6- When user hover over Route, highlight Route (change line width or strokeWeight)
7- When user click on Route:
A- Highlight selected Route
B- Show Route data below map (see attached picture)
C- Show toggle button to keep highlight On/Off
8- When user hover over Marker, highlight Routes related to Marker
9- When Markers collide, show marker in different color
10- When routes collide (overlap), show overlap section in different color
11- When user hover over overlap section, highlight all routes related to overlap