---
title: "Railroad Grade Crossing"
url: "https://commonwaysystem.org/patterns/intersections/railroad-grade-crossing/"
id: "INT-RGC-15"
description: "An at-grade crossing where a street meets an active rail line, with its own geometry, warning devices, and low-clearance-vehicle risk distinct from any road-to-road intersection."
updated: "2026-09-26"
---

# Railroad Grade Crossing

`INT-RGC-15`

Situational / Discouraged Intersections & Crossings

Railroad Grade Crossing

An at-grade crossing where any street type meets an active rail line, with its own geometry, warning devices, and low-clearance-vehicle risk distinct from any road-to-road intersection.

Typical at: Undeveloped Rural Suburban

Compact, Urban, and Core are also possible wherever an active rail line crosses a public street. The pattern is most common near industrial or agricultural rail spurs, but it is not exclusive to them.

## Design notes

This is its own pattern, not a row on another page, because it has its own geometry standard, its own required warning devices (distinct from any road-only intersection control), and its own sight-distance rules that vary by railroad company. It also applies across street types, not just [Industrial Collector](https://commonwaysystem.org/patterns/collectors/industrial-collector.md) (COL-IND-03) or [Rural Collector / Farm-to-Market Road](https://commonwaysystem.org/patterns/collectors/rural-collector.md) (COL-FTM-02), where an active spur is a realistic condition.

The core hazard is a "humped" or high-profile crossing that can strand a low-ground-clearance or long-wheelbase vehicle on the tracks. This is a distinct failure mode from any other intersection risk in this guidebook.[1][2]

-   **Approach grade.** The maximum approach grade should not exceed 3 inches of rail elevation at a point 30 ft from the center of the nearest rail, on both sides.[3]
-   **Warning device.** Where an existing humped crossing cannot be corrected, the MUTCD W10-5 Low Ground Clearance sign, with its W10-5P plaque, is the required warning device.[3]
-   **Sight lines.** Required sight-line distances vary by the specific railroad company operating the line, not a single national number.[3]
-   **Storage and queuing.** A crossing located near a highway intersection carries a higher collision rate in part because of the short vehicle storage area between the crossing and the intersection. Queues can form across the crossing itself.[4]
-   **Pedestrians.** Pedestrian-specific treatments are a separate design discipline from vehicle treatments: inter-track fencing, pedestrian gates, swing gates, channelization, and detectable warning surfaces.[5]

## Related patterns

[Industrial Collector](https://commonwaysystem.org/patterns/collectors/industrial-collector.md) (COL-IND-03) (an active rail spur is a realistic condition on industrial land), [Rural Collector / Farm-to-Market Road](https://commonwaysystem.org/patterns/collectors/rural-collector.md) (COL-FTM-02) (rail spurs are plausible in agricultural contexts), [Signal](https://commonwaysystem.org/patterns/intersections/signal.md) (INT-SIG-03) (a nearby signalized intersection is the storage and queuing interaction described above)

## References

1.  Legal / regulatory [Federal Highway Administration and Federal Railroad Administration, _Highway-Rail Crossing Handbook_, Third Edition.](https://railroads.dot.gov/sites/fra.dot.gov/files/2024-10/GXHandbook2019FRAFHWA.pdf)
2.  Evidence-based [Eck, R.W. and Kang, S.K., "Low-Clearance Vehicles at Rail-Highway Grade Crossings: An Overview of the Problem and Potential Solutions," _Transportation Research Record_ 1327 (1991), pp. 27 to 35.](https://onlinepubs.trb.org/Onlinepubs/trr/1991/1327/1327-005.pdf)
3.  Legal / regulatory [Florida Department of Transportation, _FDOT Design Manual_, Topic #625-000-002, Section 220 "Railroads" (humped crossing definition and MUTCD W10-5 sign requirement).](https://fdotwww.blob.core.windows.net/sitefinity/docs/default-source/roadway/fdm/2024/2024fdm220rr.pdf)
4.  Legal / regulatory [Federal Highway Administration, _Highway-Rail Crossing Handbook_, Appendix B, "Components of a Highway-Rail Grade Crossing."](https://highways.dot.gov/safety/hsip/xings/highway-rail-crossing-handbook-third-edition/b-appendix-components-highway-rail)
5.  Legal / regulatory [Federal Railroad Administration, "Engineering Design for Pedestrian Safety at Highway-Rail Grade Crossings."](https://railroads.dot.gov/sites/fra.dot.gov/files/fra_net/16553/Engineering_for_Ped_Safety_At_Crossings_final.pdf)