The emission spectrum for sodium shows only two colors in the visible color range. The two colors are yellow and have wavelengths of about 590 nm. The continuous spectrum and calibration scale is shown to give approximate wavelength values. A CD-ROM mirrored surface behaves like a grating or prism. If you look at the surface of the CD-ROM under a light, you can see the color spectrum.
Street lights are sodium vapor lamps in many communities.
These lamps have an orange yellow tint. You can see from the emission spectrum why the sodium vapor lamps would appear yellow and not white. These lamps consume less energy than the older blue colored mercury vapor lamps. Mercury vapor lamps have been sold in hardware stores for yard lighting. One of the odd things that we sometimes notice is that colored things have a different appearance in natural daylight than they do under mercury vapor or sodium vapor lamps.