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south of
Seattle. The first American towers were 100 ft (30 m) tall with a fixed-in-place lighting system that could not be lowered. A later project in 1968 featured a 150 ft (46 m) fixed-lighting tower on the Texas-Arkansas state line with two other 100 ft (30 m)
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or recreational field. It is used at sites that require lighting over a large area. The pole that the lighting is mounted on is generally at least 30 m (98 ft) tall (under this height it is referred to as conventional lighting system), while the lighting consists of a luminaire ring
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Prior to the 1960s, highway lighting was often provided by shorter (approx. 30 ft (9.1 m)) lighting poles with mercury vapor lamps. Advancements in high-mast illumination took place extensively in the mid-1960s in both Europe and North
America. In 1966, the
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surrounding the pole with one or several independent lighting fixtures mounted around it. Most units have four, six or eight lights in the ring, with three, five, ten, twelve and sixteen lights used in rarer instances. While most high-mast lights are
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or light trespass from affecting neighborhoods adjacent to the highway. Maintenance of these systems is done by lowering the luminaire ring from the mast head to the base using a winch and motor to the ground or at a height accessible by a
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with exceptional results. By 1967, Europe was known to have high-mast illumination technology in practice. 1968 saw the first permanent US installations of high-mast illumination starting in
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fixed-lighting towers on either side of the state-border. By 1969/70, winch systems for the lighting systems were developed and several 175 ft (53 m) towers were installed in
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Modern high-mast illumination towers typically range from 125 to 175 ft (38 to 53 m) tall and roughly 700 ft (210 m) in spacing.
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is a tall pole with lighting attached to the top pointing towards the ground, usually but not always used to
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180:'s design of some of the first modern high-mast lighting towers in the US during the 1960s and 1970s.
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installed a temporary 120 ft (37 m) tall high-mast tower at a highway interchange in
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High-mast lights in conjunction with shorter lampposts at the Tainan System
Interchange (
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and located in areas to allow for easier access without disrupting traffic.
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259:. www.HoustonFreeways.com: Oscar F. "Erik" Slotboom. pp. 76β83.
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High-mast lighting used on
Ontario Highway 401 during the day
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is considered to have the world's best-lit freeways.
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A light tower on
Interstate 30 near Greenville, Texas
257:Houston Freeways: A Historical and Visual Journey
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204:"Section 4: Conventional vs. High Mast Lighting"
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206:. Highway Illumination Manual. Archived from
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28:High-mast lighting tower in a stadium
230:"Highway Lighting Unit Construction"
202:Lopez, Carlos A. (1 November 2003).
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36:A six-lamp configuration on a mast
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176:served as a major influence on
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136:Texas Transportation Institute
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20:A high mast light in Toronto
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44:High-mast lighting used on
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289:Light tower (equipment)
255:Slotboom, Erik (2003).
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102:high-pressure sodium
129:Development history
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93:High-mast lighting
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210:on 4 October 2011
140:Fort Worth, Texas
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232:. Archived from
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118:light pollution
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238:. Retrieved
234:the original
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212:. Retrieved
208:the original
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110:metal halide
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294:Flood light
303:Categories
240:31 October
214:31 October
184:References
314:Lighting
278:See also
80:, Taiwan
48:at night
157:Belgium
153:Houston
70:ε°εη³»η΅±δΊ€ζ΅ι
66:Chinese
263:
170:Austin
149:Dallas
78:Tainan
68::
178:TxDOT
174:Texas
72:) in
261:ISBN
242:2011
216:2011
151:and
112:and
168:in
114:LED
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192:^
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108:,
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269:.
244:.
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