Many local governments have detailed geographic data for their community’s streets and highways. But accurate transportation analysis, such as routing work crews or inspectors and assessing fire station coverage, requires a network dataset with correct network connectivity. One-way streets, overpasses, and speed limits affect the routes vehicles can take between streets, so your data must account for these variables.
We've just released a set of Tasks in ArcGIS Pro to walk you through a step-by-step process to help you clean and prepare your data, transform it into a provided schema, create a network dataset from a provided template, and validate the network.
Check out this post on the ArcGIS blog for details:
Or if you just want to get started, download the project here: http://arcg.is/z1GrG