Round Rock, TX
The UP line crosses I-35's frontage road at grade: 38,600 vehicles a day.
Summary
| Metro | Austin |
|---|---|
| Railroads | Union Pacific |
| Open at-grade crossings | 18 |
| Vehicles a day crossing tracks at grade | 147,554 |
| Busiest crossing in the model | IH-35 frontage (NB) (448427T): 38,619 vehicles/day, 19 trains/day |
| Growth driver | Austin metro, sixth-largest U.S. gain in 2025 |
| Data source | FRA Crossing Inventory, retrieved Oct 2, 2026 |
Blockage scenario
Time
$384K
17,941 person-hours a year
Trade
358
truck-hours a year, worth $13K in driver time
Pollution
29 t
CO₂ from 3,178 gallons idled, like 6.2 cars for a year
Example scenario. No blockage reports have been compiled for this city yet.
| Blockages modeled per crossing per year | 156 |
|---|---|
| Vehicles stopped by one blockage | 612 |
| Trucks stopped by one blockage | 18 |
| Person-hours lost per year | 17,941 |
| Value of lost time per year | $384K |
| Truck-hours idled per year | 358 |
| Gallons of fuel idled per year | 3,178 |
| CO₂ per year (metric tons) | 29 |
Screening estimate. Each selected crossing is blocked for the set time; drivers wait half of it on average. Method and sources
Crossings in the model
| Crossing | USDOT ID | Vehicles/day | Trains/day | Trucks |
|---|---|---|---|---|
| 448427T | 38,619 | 19 | 3% | |
| 439680P | 20,092 | 23 | 3% |
Uncheck a crossing to remove it from the scenario. "~" truck shares use the city's traffic-weighted average where the inventory reports none.
On the record
- The Austin–Round Rock–San Marcos metro reached 2,620,945 people in 2025 (+53,796), the sixth-largest gain in the U.S.
U.S. Census Bureau · Mar 26, 2026 ↗