Phase VII · FE Civil Academy
Transportation Engineering
Design and operate roadways for capacity, safety and comfort.
Topic mastery
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Practical scenario
A rural two-lane highway needs a horizontal curve and a crest vertical curve that both satisfy stopping sight distance at 55 mph.
Why this matters
Geometric design, sight distance and traffic operations make transportation a consistently large exam block.
Concept explanation
- Stopping sight distance combines driver reaction distance and braking distance including grade.
- Horizontal curve design balances superelevation and side friction against the required radius.
- Vertical curve length is controlled by sight distance and the algebraic grade difference.
- Traffic flow relates volume, speed and density; capacity analysis assigns level of service.
Unit guidance
- Write units on every substituted value.
- Cancel units symbolically before evaluating numbers.
- Confirm the result unit matches the quantity you were asked for.
Handbook navigation
- Open the Transportation Engineering section of the handbook.
- Search the term "geometric design of roadways" rather than scrolling.
- Note the equation number so you can return to it quickly.
Calculator guidance
- Confirm angle mode before any trig entry.
- Store intermediate values in memory instead of re-keying rounded numbers.
- Round only at the final answer.
FE strategy
- Check the S versus L assumption after computing, and revise if it fails.
- Downgrades increase stopping distance — the sign matters.
Conceptual example
A conceptual transportation engineering item will ask which quantity increases, decreases, or stays the same when one input changes. Reason from the governing relationship, not from memory of a numeric answer.
Common mistakes
- Using V in ft/s inside formulas written for mph.
- Applying the S > L vertical curve formula when S < L.
- Ignoring the grade term in braking distance.
Guided practice
- Work the first worked example with the solution visible.
- Re-solve it closed-book and compare every step.
- Explain the unit cancellation out loud.
Independent practice
- Complete a 10-question Transportation Engineering quiz in practice mode.
- Classify every miss by error category.
- Re-test the missed subtopic within 48 hours.
Summary
- SSD = reaction + braking, grade included.
- R = V²/(15(e+f)).
- Verify the S vs L assumption on vertical curves.
Capstone application: Roadway geometry, traffic and pavement design modules.