Recent activity in Traffic Engineering

For a given traffic stream, the speed-density relationship is given as:\[v=v_{o} \ln \left(\frac{k_{j}}{k}\right)\]where $v$ is the mean speed (in $\mathrm{km} / \mathrm{...

Traffic is moving on a $6$-lane dual carriageway road. Traffic volume per direction during peak hour ($08:00$ am to $09:00$ am) is $6000 \mathrm{~veh} / \mathrm{h}$. It i...

A road is divided into four sections having varying widths as shown in the figure. Section-$2$ (S$2$) represents a capacity constrained condition with respect to the traf...

The travel times of three vehicles on a $2$ km stretch of road are $4,5,$ and $8$ minutes. Assuming the speed of each vehicle to be constant in this stretch, the Space Me...

A horizontal curve of radius $1080 \mathrm{~m}$ (with transition curves on either side) in a Broad Gauge railway track is designed and constructed for an equilibrium spee...

The figure presents the time-space diagram for when the traffic on a highway is suddenly stopped for a certain time and then released. Which of the following statements a...

For a traffic stream, $v$ is the space mean speed, $k$ is the density, $q$ is the flow, $\nu_{f}$ is the free flow speed, and $k_{j}$ is the jam density. Assume that the ...

Assuming that traffic on a highway obeys the Greenshields model, the speed of a shockwave between two traffic streams $\text{(P)}$ and $\text{(Q)}$ as shown in the schema...

The vehicle count obtained in every $10$ minute interval of a traffic volume survey done in peak one hour is given below.$$\begin{array}{|c|c|} \hline \text{Time Interval...

A two-phase signalized intersection is designed with a cycle time of $100\:s$. The amber and red times for each phase are $4\:s$ and $50\:s$, respectively. If the total l...

A student riding a bicycle on a $5$ km one-way street takes $40$ minutes to reach home. The student stopped for $15$ minutes during this ride. $60$ vehicles overtook the ...

A pavement designer has arrived at a design traffic of $100$ million standard axles for a newly developing national highway as per $IRC:37$ guidelines using the following...

A traffic survey conducted on a road yields an average daily traffic count of $5000$ vehicles. The axle load distribution on the same road is given in the following table...

A superspeedway in New Delhi has among the highest super-elevation rates of any track on the Indian Grand Prix circuit. The track requires drivers to negotiate turns with...

On a circular curve, the rate of superelevation is $e$. While negotiating the curve a vehicle comes to a stop. It is seen that the stopped vehicle does not slide inwards ...

A sign is required to be put up asking drivers to slow down to $30$ km/h before entering Zone $Y$ (see figure). On this road, vehicles require $174$ m to slow down to $30...

If the total number of commercial vehicles per day ranges from $3000$ to $6000$, the minimum percentage of commercial traffic to be surveyed for axle load is$15$$20$$25$$...

While traveling along and against the traffic stream, a moving observer measured the relative flows as $50$ vehicles/hr and $200$ vehicles/hr, respectively. The average s...

Two cars P and Q are moving in a racing track continuously for two hours. Assume that no other vehicles are using the track during this time. The expressions relating the...

The safety within a roundabout and the efficiency of a roundabout can be increased, respectively, byincreasing the entry radius and increasing the exit radiusincreasing t...

The queue length (in number of vehicles) versus time (in seconds) plot for an approach to a signalized intersection with the cycle length of $96$ seconds is shown in the ...

The radius of a horizontal circular curve on a highway is $120$ m. The design speed is $60$ km/hour, and the design coefficient of lateral friction between the tyre and r...

The space mean speed (kmph) and density (vehicles/km) of a traffic stream are linearly related. The free flow speed and jam density are $80$ kmph and $100$ vehicles/km re...

There are $20,000$ vehicles operating in a city with an average annual travel of $12,000$ km per vehicle. The NOx emission rate is $2.0$ g/km per vehicle. The total annua...

A well-designed signalized intersection is one in which thecrossing conflicts are increasedtotal delay is minimizedcycle time is equal to the sum of red and green times i...

The uniform arrival and uniform service rates observed on an approach road to a signalized intersection are $20$ and $50$ vehicles/minute, respectively. For this signal, ...

The speed-density relationship in a mid-block section of a highway follows the Greenshield’s model. If the free flow speed is $v_f$ and the jam density is $k_j$, the maxi...

Traffic on a highway is moving at a rate of $360$ vehicles per hour at a location. If the number of vehicles arriving on this highway follows Poisson distribution, the pr...

Average free flow speed and the jam density observed on a road stretch are $60 \: km/h$ and $120$ vehicles/km, respectively. For a linear speed-density relationship, the ...

$24$-$h$ traffic count at a road section was observed to be $1000$ vehicles on a Tuesday in the month of July. If daily adjustment factor for Tuesday is $1.21$ and monthl...

Traffic volume count has been collected on a $2$-lane road section which needs upgradation due to severe traffic flow condition. Maximum service flow rate per lane is obs...

Spot speeds of vehicles observed at a point on a highway are $\text{40, 55, 60, 65 and 80 km/h}$. The space-mean speed (in $\text{km/h}$, $\textit{round off to two decima...

The traffic starts discharging from an approach at an intersection with the signal turning green. The constant headway considered from the fourth or fifth headway positio...

For an axle load of $15$ tonne on a road, the Vehicle Damage Factor (round off to two decimal places), in terms of the standard axle load of $8$ tonne, is __________.