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PTOE Exam Prep > Module 3: Operational Effects of Geometric Design > Flashcards

Module 3: Operational Effects of Geometric Design Flashcards

1
Q

What is considered “high speed”?

A

High Speed >= 50 MPH

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2
Q

What is considered “low speed”?

A

Low Speed <= 45 MPH

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3
Q

For stopping sight distance, what is considered comfortable deceleration attainable on wet pavement and tires, poor tire conditions, emergency breaking?

A

11.2 ft/sec^2

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4
Q

What is typical perception/reaction time used for stopping sight distance?

A

2.5 seconds

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5
Q

For SSD what is assumed driver eye height?

A

3.5 feet

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6
Q

For SSD, what is assumed object height?

A

2 feet

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7
Q

For PSD, what is the assumed object height?

A

3.5 feet

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8
Q

What are the four components of passing sight distance (PSD)?

A
  1. Distance traveled during perception/reaction time
  2. Distance traveled while passing in left lane
  3. Clear Distance between passing vehicle and opposing vehicle
  4. Distance traveled by opposing vehicle during 2/3 of time passing vehicle is in opposite lane, or 2/3 d2
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9
Q

What is the typical range of side friction factor, f, and what does it depend on?

A

f = 0.08 to 0.27 depending on design speed

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10
Q

What is the maximum superelevation, e, allowed by AASHTO?

A

Maximum e = 0.12

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11
Q

What is the maximum superelevation, e, if snow and icy conditions prevail?

A

Maximum e for snow and icy conditions = 0.08

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12
Q

What is the horizontal clearance to obstructions needed for low speed rural roads?

A

10 feet

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13
Q

What is the horizontal clearance to obstructions needed for high-speed, high-volume roads?

A

30 feet

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14
Q

What are the options if obstacles are within the clear zone?

A
  1. Remove
  2. Redesign
  3. Relocate
  4. Make Breakaway
  5. Shield
  6. Delineate
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15
Q

What is considered a non-recoverable slope?

A

1V:4H to 1V:3H

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16
Q

What is considered a critical slope?

A

Steeper than 1V:3H

17
Q

What is considered a recoverable slope?

A

1V:4H or flatter
1V:6H or flatter preferred on high speed roads

18
Q

What is the minimum size for an island?

A

50 feet^2

19
Q

What are the three types of islands?

A
  1. Channelizing
  2. Divisional
  3. Refuge

PTOE Exam Prep (4 decks)

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