# Overview

To help in understanding the GTFS specification and in producing tools
that read and write GTFS data, take a look at the following examples of GTFS feeds:

- The [Example GTFS Feed page](https://developers.google.com/transit/gtfs/examples/gtfs-feed) provides a simple GTFS feed that can be used as a model to understand how a GTFS feed is put together.
- A list of transit agency feeds available from the [GoogleTransitDataFeed project site](http://code.google.com/p/googletransitdatafeed/wiki/PublicFeeds) is a good place to start.