Measuring wait times
The Presidential Commission on Election Administration—formed by Executive Order 13639 in response to the long lines witnessed in the 2012 elections, and published in January 2014—has as one of its key recommendations:
Jurisdictions should develop models and tools to assist them in effectively allocating resources across polling places.
The supporting best practice cited in the report reads:
Election officials should keep track of wait times at individual polling places using simple management techniques, such as recording line length at regular intervals during Election Day and giving time-stamped cards to voters during the day to monitor turnout flow.