# Dataset Description

The National Accessibility Evaluation (NAE) produces annual calculations of job access via transportation modes, for all available origin blocks across the U.S. This dataset provides a summary of the worker-weighted access by different census geography levels and travel times for the state. The worker-weighted access here represents the average number of jobs a person can reach at 8am from a specific census area origin within a given travel time threshold. The travel time thresholds are in integer minutes, at intervals from 5 minutes to 60 minutes (1 hour).

Census levels included in this dataset are:

	1. Block
	2. Block Group
	3. Census Tract
	4. County
	5. State

The data for each census level is presented in a separate CSV data file. 

## Data Files

[state]_[statecode]_[mode]_[census level]_[year].csv: These files contain the Block, Block Group, Census Tract, County, and State census levels data by mode.  

### Important Note

Due to its large size, the 'Block' level data file should not be opened outside of a person's coding platform. Attempting to open this file in Excel or a similar spreadsheet program would cut off a significant amount of data points.

## Data Fields

	1. Mode: the type of travel modes, one of auto; bike; or transit).
	2. Year: NAE data year, the year for which this dataset is relevant.
	3. State FIPS: the ID of the containing geography within which the data averages are calculated.
	4. State: the state the data corresponds to.
	5. Summary Level: the level of geography at which averages are calculated; one of state, county, census tract, block group, or block.
	6. Census ID: the ID of the particular census geography for which the data averages are calculated.
	7. Departure: the time of day a mode's accessibility is measured.
	8. LTS: Level of Traffic Stress, measured only for bike mode.
	9. Threshold: the travel time threshold in minutes, ranging from 5 to 60 minutes.
	10. Weighted_average_total_jobs: the average number of jobs a person can reach from a given census area within the travel time threshold for a specific mode.