Portland Orange is the color of light emitted from the no-crossing phase in the United States and Canada. The color has been chosen to avoid confusion with normal traffic lights in poor visibility conditions. Its chromaticity is specified by the Institute of Transportation Engineers in the technical standards of this body, as well as for traffic lights. Its application is specified in the United States Federal Manual of Uniform Traffic Control Devices. Various court standards also require Portland Orange for the absence of pedestrian signals. Color can be produced with some LEDs, and ITE reports that their wavelength accuracy is within 3 nanometers. In practice, the lighter color of the gas pipes resembles Portland Orange.