A road network, in the chase context, is the set of connected roads available for approaching, observing, repositioning around, and leaving a storm from a given position. It includes paved highways, county farm-to-market roads, and section roads, as well as the natural and legal barriers that break the grid, such as rivers, lakes, restricted lands, and international borders.
What a good network looks like
The strongest networks for chasing tend to be in the open Plains, where paved and gravel section roads form a nearly continuous grid at roughly one-mile spacing. That geometry lets a chaser jog north, east, or south with roughly equal ease as a storm evolves.
Weaker networks include forested regions with only a handful of highways, terrain broken by rivers with few crossings, and areas dominated by interstates where limited access points reduce flexibility. Interstates are often best treated as repositioning corridors rather than observation routes.
How chasers read the network
Before the storm arrives, chasers scan the map for four-way intersections that offer multiple escape directions, bridges over major rivers, and any road segments that might flood or become gravel in heavy rain. Skywarn safety guidance specifically calls out observing from four-way intersections when possible so options remain open.
During the chase, the network is re-read constantly against storm motion. A road that made sense for approach may be exactly the wrong road for exit, and the plan gets updated cell by cell.
Where the network misleads
Maps aren't always accurate, as the safety literature bluntly notes. A gravel line on a state map may be a private track, a bridge may be closed, or a road may have been reclassified since the map was made.
Heavy rain, hail accumulation, and darkness all shrink the usable network in real time. A road that was a fine option an hour ago may be flooded, blocked by downed trees or power lines, or unsafe to drive at highway speed. Treat the network as a live map, not a static one.