Very high design speeds gr revised
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Transcript of Very high design speeds gr revised
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Very High Design Speeds Case: GR
Basil Psarianos Nat’l Techn. Univ. Athens, Greece
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Transportation Research Board 2006 Annual Meeting
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IN THEORY (GR Design Guidelines 2001)
• Highest Design Speed can be: – 120 km/h (75 mph) in general for
Freeways, but • Can reach the value of
– 130 km/h (~80 mph) in flat topography
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Transportation Research Board 2006 Annual Meeting
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IN THEORY HERE…
The Design Speed is 120 km/h and
The Speed Limit is 120 km/h (75 mph)
but
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Transportation Research Board 2006 Annual Meeting
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WE MADE OUR ALCULATIONS
IN PRACTICE
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Transportation Research Board 2006 Annual Meeting
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IN PRACTICE AND THE RESULT WAS
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Transportation Research Board 2006 Annual Meeting
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IN PRACTICE, for Example Design Speed = Operating Speed = 85% Speed (as of December 2005)
On the TANGENT:
• Passenger Cars: 144 km/h (90 mph) in the driving middle lane (3.50m)
• SU Trucks: 89 km/h (55.63 mph) in the driving middle lane
• Truck-Trailers: 87 km/h (54.38 mph) in the driving middle lane
• Buses: 98 km/h (61.25 mph)
Corinth-Athens Freeway, St.:57+550
Speed Limits (km/h):
120 for PCs, 80 for SU Trucks, 70 for Truck-Trailers, 90 for Buses
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Transportation Research Board 2006 Annual Meeting
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IN PRACTICE, for Example Design Speed = Operating Speed = 85% Speed (as of December 2005) On this SHARP HORIZONTAL CURVE with R=400 m (1311 ft): Passenger Cars: 128 km/h (80 mph) in the driving right lane (3.50m)
Athens - Salonika Freeway, St. 98+000
Posted Speed : 90 km/h (56 mph)
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Transportation Research Board 2006 Annual Meeting
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Fast & General Conclusions 1. Inconsistencies between Theory
and Practice in various Design Aspects
2. High Design Speed Highways are OUT THERE; we in GR & EU do not want to admit it and perhaps face it!
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