G(Y)Maps - How to display a waypoint at a given time?

Question

Google Maps

There is a need to do the following:
1. there are two coordinates. start and end point.
2. the route is laid. let's say google laid it out.
2.1. Is it possible to save this route somehow, so as not to lay it again?
3. there is a start time for the car along the route and a time for the end of the journey.
4. there is a machine speed.
5. How to make it so that when you visit the page at any time, you can see where the car is currently located?
PS. google/yandex/osm platform has not been selected yet. I'm leaning towards osm.
The topic has just begun to be explored.

Answer 1

5 www.geocodezip.com/v3_animate_marker_directions.html

Answer 2

I bow to OSM!
project-osrm.org
map.project-osrm.org
Can be saved to GPX, for example. Or get a permalink. I think that everything is described in the documentation how to deploy, how to use it.
5. If we take the speed uniform, then it is not a problem to calculate the distance along the track of the route.