I have created a transportation network dataset from NYC streets. Upon building and creating the dataset, no significant errors were found in my attributes, connectivity, etc. However, when I run any analysis, whether it be finding drive time service areas or a simple route from point 1 to point 2, I get a constant 'solving...' message and ArcGIS does not respond. I have thoroughly looked through my set up for the dataset and there does not seem to be any obvious errors. Does anyone have some troubleshooting ideas or possible solutions?