A car hits a tree at an estimated speed of 55km/h on a

A car hits a tree at an estimated speed of 55km/h on a 3% downgrade. If skid marks are observed on 35m of dry pavement (f=0.45) followed by 75m on a grass-stabilized shoulder (f =0.2) estimate the initial speed of the vehicle.
A temporary diversion has been constricted on a highway of +4 percent gradient due to major repairs that are being undertaken on a bridge. The maximum speed on a diversion is 15km/h. determine the minimum distance from the diversion that a road sign should be located informing drivers of the temporary change on the highway
Maximum allowance speed on highway =100km/h
Letter height of road sign = 100mm
Coefficient of friction between tires and pavement = 0.2
Perception-reaction time =2.5 sec
Assume that a driver can read a road sign within his or her area of vision at a distance of 0.5m for millimeter of letter height
The radius of a horizontal curve on an existing highway is 230m. if the supper elevation at the curve is 0.08 and the maximum speed limit on the road is 100km/h; is this hazardous location on the highway? If so why and what action will you recommend to correct the situation?
Data obtained from aerial photography showed six vehicles on a 700m long section of road. Traffic data collected at the same time indicated an average time headway of 4 sec. determine
The density on the highway
The flow on the road
The space mean speed
Two set of the students are collecting traffic data at two sections xx and yy of a highway 1500ft apart. Observations at xx show that five vehicles passed that section at intervals of 343and 5 sec. if the speed of vehicles were 50454035 and 30 mi/h respectively draw a schematic showing the locations of vehicles 20 secs after the first vehicle passage section xx. Also determine
The time mean speed
The space mean speed
The density on the way
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