Chartered Civil Engineer (ICE) Transportation and Highway Engineering Syllabus

Transportation and Highway Engineering syllabus — full chapter and topic list

Expand any chapter to see its topics and sub-topics. This is the whole examinable outline for Transportation and Highway Engineering in Chartered Civil Engineer (ICE), not a summary of it.

1. 1

   Highway Geometric Design

   5 topics

   • Design standards (DMRB) and design speed
   • Horizontal alignment
     • Curves, superelevation and transitions
   • Vertical alignment and sight distances
   • Junction design
     • Priority junctions, roundabouts and signals
   • Sustainable transport and active travel provision
2. 2

   Pavement Engineering

   4 topics

   • Flexible and rigid pavement structures
   • Pavement design methods and traffic loading
   • Pavement materials
     • Asphalt mixtures and bituminous binders
     • Concrete pavements
   • Pavement maintenance and asset management
3. 3

   Traffic Engineering and Planning

   4 topics

   • Traffic flow theory and capacity analysis
   • Transport modelling and demand forecasting
   • Traffic management and road safety audit
   • Integrated transport policy and modal shift

Transportation and Highway Engineering flashcards for Chartered Civil Engineer (ICE)

25 of 50 cards from the Transportation and Highway Engineering deck — real questions with worked answers.

1. What does the acronym DMRB stand for, and what is its role in UK highway design?

   DMRB stands for the Design Manual for Roads and Bridges. It is the suite of standards, advice and specifications governing the design, assessment and operation of motorways and all-purpose trunk roads in the UK (published by National Highways and the devolved administrations).

2. Define 'design speed' in highway geometric design and give the standard UK design speed values.

   Design speed is the speed used to derive the geometric parameters (curvature, sight distance, gradient) of a road so it can be safely used. UK design speeds are taken from a defined set: 50, 60, 70, 85, 100 and 120 km/h (i.e. $50A$ to $120A$ in DMRB notation).

3. In DMRB CD 109, how is the design speed of a rural road related to the alignment and layout constraints $V_L$ and the bendiness/visibility?

   Design speed is estimated from the harmonic mean visibility and the layout constraint (carriageway and verge width). A graphical/empirical relationship combines the bendiness (degrees of curvature per km) and the layout constraint $L_c$ to read off the design speed band.

4. What are the two principal types of horizontal curve transition, and why is a transition curve used?

   The two are the circular arc and the transition (spiral) curve, normally a clothoid. A transition is used to gradually introduce curvature and superelevation, allowing the radial (centrifugal) acceleration to build up uniformly so the lateral jerk is comfortable and safe.

5. State the equation of the clothoid (Euler spiral) used as a transition curve, relating radius $R$ and arc length $L$.

   The clothoid has the property that radius is inversely proportional to length: $$RL = A^{2}$$ where $A$ is the clothoid parameter (constant). At any point the radius $r = A^{2}/l$.

6. Give the formula for the minimum radius of a horizontal circular curve in terms of design speed $V$, superelevation $e$ and side friction factor $f$.

   $$R = \frac{V^{2}}{127\,(e+f)}$$ where $V$ is in km/h, $R$ in metres, and $e$ and $f$ are expressed as decimal fractions (the 127 comes from $g$ and unit conversion).

7. What is superelevation, and what maximum value is normally adopted on UK trunk roads?

   Superelevation is the transverse banking of the carriageway across a horizontal curve to counter centrifugal force. On UK roads it is normally limited to a maximum of 7% ($e_{max}=0.07$), with 5% commonly used in design.

8. Define the length of transition $L_s$ used to limit rate of change of radial acceleration, giving the standard formula.

   $$L_s = \frac{V^{3}}{3.6^{3}\,C\,R}$$ where $V$ is design speed (km/h), $R$ the curve radius (m), and $C$ the rate of change of radial acceleration (typically $0.3$ m/s$^3$ for comfort).

9. What are the two key sight distances controlling vertical alignment, and what does each represent?

   Stopping Sight Distance (SSD): distance for a driver to perceive a hazard and stop. Full Overtaking Sight Distance (FOSD): distance needed to safely complete an overtaking manoeuvre on a single carriageway. SSD governs crest curves; FOSD relevant on single carriageways.

10. Give the standard formula for Stopping Sight Distance (SSD).

    $$SSD = vt + \frac{v^{2}}{2g(f \pm s)}$$ where $v$ is speed (m/s), $t$ the perception–reaction time (commonly 2 s), $f$ the longitudinal friction coefficient, $s$ the gradient (+ uphill, − downhill), and $g=9.81$ m/s$^2$.

11. For a crest (summit) vertical curve, give the K-value relationship for length $L$ where the sight distance $S < L$.

    $$L = K \cdot A = \frac{A\,S^{2}}{200\left(\sqrt{h_1}+\sqrt{h_2}\right)^{2}}$$ where $A$ is the algebraic difference in grades (%), $S$ the sight distance, and $h_1,h_2$ the driver eye and object heights. $K$ is the length of curve per 1% change in gradient.

12. What driver eye height and object height does DMRB use for stopping sight distance on a crest curve?

    Driver eye height range is 1.05 m to 2.00 m; the object (hazard) height range is 0.26 m to 2.00 m. SSD must be available for the worst-case combination across these ranges.

13. Why are sag (valley) vertical curves governed by different criteria than crest curves, and what controls their length?

    On sag curves the daytime line of sight is not obstructed by the road surface, so they are governed by headlight sight distance at night, passenger comfort (vertical acceleration), and clearance under overbridges, rather than the crest sight-line geometry.

14. Name the principal at-grade junction types used in UK highway design.

    Priority (T- and staggered) junctions, roundabouts (normal, mini, compact, signalised, grade-separated), and signalised crossroads/junctions. Grade-separated junctions (interchanges) separate conflicting flows on different levels.

15. What is the difference between a normal roundabout and a mini-roundabout per DMRB?

    A normal roundabout has a kerbed (raised) central island of diameter $\geq 4$ m and an inscribed circle diameter usually $\geq 28$ m. A mini-roundabout has a flush or domed painted/over-runnable central island, used where space is limited (typically 30 mph or less environments).

16. State the empirical Kimber (TRL) relationship form used to predict roundabout entry capacity.

    Entry capacity is a linear function of circulating flow: $$Q_e = k\,(F - f_c\,Q_c)$$ where $Q_e$ is entry capacity, $Q_c$ the circulating flow, and $F$, $f_c$, $k$ are geometric parameters derived from entry width, approach width, flare length, inscribed circle diameter, entry angle and entry radius.

17. In the context of active travel, what is an LTN 1/20 and what design hierarchy does it promote?

    LTN 1/20 is the UK Local Transport Note 'Cycle Infrastructure Design'. It promotes a user hierarchy prioritising pedestrians then cyclists over motor traffic, and five core design principles: cycle networks should be Coherent, Direct, Safe, Comfortable and Attractive.

18. Define 'modal shift' in transport policy.

    Modal shift is the transfer of travel demand from one mode of transport to another, typically encouraging a shift away from single-occupancy private cars towards more sustainable modes (walking, cycling, public transport).

19. List, in order, the 'sustainable transport hierarchy' commonly applied in UK planning.

    1. Walking, 2. Cycling, 3. Public transport, 4. Shared/ultra-low-emission vehicles and freight, 5. Private cars. Higher modes are prioritised in design and investment to reduce car dependency.

20. Compare flexible and rigid pavements in terms of structural behaviour and load distribution.

    Flexible (bituminous) pavements distribute load through successive layers by grain-to-grain transfer, deflecting under load; the surface follows subgrade deformation. Rigid (concrete) pavements act as a stiff slab carrying load primarily in flexure (beam action), spreading it over a wide area, with much lower reliance on subgrade strength.

21. Name the typical layers of a UK flexible pavement from top to bottom.

    Surface course (wearing course), binder course (basecourse), base (roadbase), sub-base, capping (if needed), and the subgrade (foundation soil).

22. What are the principal types of rigid concrete pavement?

    Jointed Unreinforced Concrete (URC/JPCP), Jointed Reinforced Concrete (JRC), and Continuously Reinforced Concrete Pavement (CRCP) — the latter has no transverse joints, controlling cracking with continuous longitudinal reinforcement.

23. Define the Standard Axle and the load it represents in UK pavement design.

    The Standard Axle is the reference axle load used to convert mixed traffic to equivalent damage. In the UK it is an 80 kN (8 tonne) single axle with dual wheels, designated 1 ESA (Equivalent Standard Axle) or msa when expressed in millions.

24. State the 'fourth power law' relating axle load to pavement damage.

    The damaging effect of an axle is approximately proportional to the fourth power of its load: $$\text{Damage factor} = \left(\frac{P}{P_{std}}\right)^{4}$$ where $P$ is the axle load and $P_{std}$ the standard axle (80 kN). Doubling axle load increases damage roughly 16-fold.

25. What is 'msa' in pavement design and how is design traffic estimated?

    msa = millions of standard axles, the cumulative number of equivalent 80 kN standard axle passes over the design life. It is estimated from the daily commercial vehicle flow, growth rate, design period, lane/wear factors and a wear (damage) factor per commercial vehicle.

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