Pals and Pervs

Topics: Road infrastructure, Freeway, Expressway Pages: 8 (2174 words) Published: April 6, 2013
Expressway Characteristics
n expressway is a limited-access, controlled-access highway. Vehicles are allowed to enter and leave an expressway only at designated locations. There are no intersections, so cross-traffic is eliminated and traffic flows in only two directions. Expressways include freeways, interstates and toll roads.

Traffic usually moves at higher speeds.
To keep the flow of traffic smooth, expressways have maximum and minimum speed limits. Also to prevent slow traffic and for everyone's safety, pedestrians and bicyclists are not allowed on these roads. ome expressways are curved, banked and designed to maximize safety at higher speeds. This type of roadway communicates with drivers through large directional signs. They are easy to read and placed in locations that give drivers plenty of time to maneuver if they need to get on or off the expressway. Usually, one-mile prior to each exit, at least three signs are posted to help drivers prepare to exit. Watch for distance to exit and lane positions.

There are also "exit" signs to inform drivers where the exit is located. Interchanges
Interchanges are designed to connect drivers to other expressways on smaller state highways, through a carefully developed system of ramps and over/underpasses. This allows for fewer interruptions of the traffic flow.

Types of interchanges include designs that are shaped like a cloverleaf, a diamond and a trumpet. A cloverleaf interchange is designed to eliminate conflicting traffic when you make a left turn or try to cross traffic. diamond interchange is used when a road with low traffic intersects an expressway. Left turns can be made with lower risk on the low traffic road, so a full cloverleaf is not necessary or economical. Trumpet interchanges are used when a low traffic road ends at a t-intersection of an expressway. The trumpet shape allows traffic to enter and leave the expressway without having to cross traffic. Entering Expressways

While driving on an expressway, check your mirrors for traffic conflicts using short quick glances. Try to predict the possible actions of other drivers and be prepared to react. Use low hand steering to avoid over steering. Remain completely focused while you are driving; manage your distractions while searching far ahead.

Before entering an expressway, you need to recognize the entrance signs and make sure your entrance is the correct one. Before approaching an entrance ramp, know the direction you intend to travel.

Directional signs are posted at most entrances and communicate the route number and direction (north, south, east, or west) the entrance will lead you to.

Be careful not to enter an expressway using an exit ramp – if this happens, oncoming traffic could be approaching you at high speeds. You can prevent this critical mistake by searching for signs that say, "DO NOT ENTER".

Often, drivers get on the wrong entrance ramp, heading in the wrong direction for their destination. If this happens, never stop, back up or make a sudden swerve to correct your mistake. Continue on the entrance and leave the expressway at the next exit.

You enter most entrance ramps at low speeds and they often have sharp curves. If there is a warning sign posted with a speed limit, follow the advice on the sign - sharp curves often require very low speeds. Be extra cautious if you are driving a large vehicle, SUV or truck.

Most entrance ramps also have an acceleration lane to help you adjust your speed to the traffic flow on the expressway. Check your mirrors for traffic behind you and to the sides.

Signal your intention to merge as you enter the acceleration lane.

Use your time in the acceleration lane to evaluate the freeway traffic, look for a space to merge and begin to adjust your speed. Judge the speed of the traffic you are about to enter. Be prepared to slow or accelerate quickly depending on the flow. Often drivers enter a very crowded and...
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