How do I determine where I can get from the city by car? [closed]

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How do I determine where I can get to from the city (say New York) for 2 hours (can change) by car?

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First create a graph :

• each edge is a road
• each vertex is a city

Second Give a weight to each road = weight is the time from one city to another using this edge considering traffic etc...

Use Dijkstra's algorithm for example to calculate the min distance between 2 cities

Finally chose all the one with a weight less than 2 hours

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I found Google Distance Matrix API. It's kind of what should be )