The illuminations on the
cables, while part of the original design, are actually a relatively recent addition, made practical by the availability of high efficiency
compact fluorescent lamps.
The original
roadway illumination was by
low pressure sodium vapor lamps, which while efficient give off a garish monochromatic yellow light. On the lower deck these have been replaced with tubular
fluorescent lights attached to the bottom of the upper deck, while on the upper deck the illumination is by
high pressure vapor lamps, which give off a more full spectrum light.