Using the ODOT interchange design guidelines, answer the following questions. Wh

Question

Using the ODOT interchange design guidelines, answer the following questions.

What should the ramp speed be for a 70 mph freeway without a speed advisory sign?

What should the minimum ramp speed be for a 70 mph freeway with a speed advisory sign?

For two sequential exit ramps along a freeway, what is the minimum spacing between the ramps?

What is the minimum spacing on a freeway between an entrance ramp and an exit ramp?

What is the minimum spacing on a freeway between an exit ramp and an entrance ramp?

For a 65 mph freeway, how long should be the acceleration lane when there is a horizontal curve on the ramp with an advisory speed of 35 mph?

If for the following question, the ramp is at a 5% upgrade, what is the acceleration lane length?

For a 55 mph urban freeway, how long should be the deceleration lane when there is a horizontal curve on the ramp with an advisory speed of 25 mph?

If for the following question, the ramp is at a 5% downgrade, what is the acceleration lane length?

For a 70 mph rural freeway interchange with another 70 mph freeway using a diverging system, what should be gore length and the nose width?

Explanation / Answer

The ramp speed be for a 70 mph freeway without a speed advisory sign should be 20 mph. It is different for different countries.

The minimum ramp speed be for a 70 mph freeway with a speed advisory sign should be 80 mph.

minimum spacing between the ramps is

minimum spacing on a freeway between an entrance ramp and an exit ramp is 0.625 miles for rural all purpose roads. For Rural mortarways it is 1.25 miles.

minimum spacing on a freeway between an exit ramp and an entrance ramp is 19.8XV ft( where V is mph).

For a 65 mph freeway, the acceleration lane when there is a horizontal curve on the ramp with an advisory speed of 35 mph is 540 ft.(0.1022 miles).

if the ramp is at a 5% upgrade, the acceleration lane length is- 0.094miles

For a 55 mph urban freeway, the deceleration lane when there is a horizontal curve on the ramp with an advisory speed of 25 mph should be 235 ft( 71.62 meteres)

if the ramp is at a 5% downgrade, the acceleration lane length is 0.0568 miles

70 mph rural freeway interchange with another 70 mph freeway using a diverging system, the gore length and the nose width is 35 ft.

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