Analysis of predominant wind direction to determine runway orientation, determine the size of runway border and safety areas, different wing tip to wing tip clearances for all gates and must designate the clear zones in the entire port.

This denotes the edge of the roadway. Any asphalt or concrete surface beyond this line should not be used during the normal operation of your vehicle.

Solid white shoulder line

An area filled with ________ and bordered by solid white lines is not considered part of the roadway, and vehicles are expected to stay off unless there is an emergency. These areas are often used to ease the flow of traffic where roads diverge or intersect.

Diagonal white lines

This denotes the center of a two-lane road, or marks the division between lanes on multi-lane roads. It is a reminder to stay in your lane. Straddling the line is illegal and punishable under the law. As the line is “broken,” however, this means it is legal to cross it when overtaking or changing lanes.

Broken white center line or lane divider

This is often used to divide traffic on a two-way multi-lane road. As this is a solid line, you are discouraged from overtaking over it unless the way is absolutely clear.

Solid white center line

As we noted a while back, this line indicates that it is unsafe to overtake at any time. It is often found around blind curves or in areas where fast-moving two-way traffic meets on an undivided road.

Solid yellow double center line

This indicates that only one side can overtake--the side with the broken line. This is often found entering curves where the view is obstructed coming from one direction, but is clear from the opposite side.

Mixed center line/solid yellow with broken yellow or white line

These are often found near intersections, and are reminders to stay in lane. As a practice, if you're turning at an intersection, it's best to get into the turning lane 50m before the intersection, while the lane divider is still broken.

Solid white lane divider

When combined with solid white lane dividers, they indicate which directions you are allowed to go within a lane. If the arrow points forward only, you cannot make a turn from that lane. If it points forward and to the side, you can either go straight or turn. If it points only to the side, you must turn within that lane.

Directional arrows

This indicates the motorbike lane along major thoroughfares. The broken line indicates that you can move into and out of it, but the lane is preferentially for motorbikes.

Broken blue lane divider

This indicates the bus lane on EDSA, but can also be used to indicate bicycle lanes in some areas. Bicycle lanes may also be indicated by solid white lines on the side of the road.

Solid yellow lane divider

This indicates areas where you can merge into the bus lane in preparation for turning off

Broken yellow lane divider

This indicates that traffic on the solid yellow side cannot cross lanes, while traffic on the other side may do so if the way is clear. This is often used where smaller arteries merge into main roads or where feeder roads merge onto the highway.

Mixed double lane divider/solid yellow with broken yellow or white line

These tightly spaced horizontal white lines not only give your car's suspension a bit of a workout, they also indicate hazards ahead, such as dangerous curves or merging traffic.

Rumble strips

This indicates where you must stop at a stoplight or stop sign.

Solid white horizontal line

This indicates a pedestrian crossing zone. Stopping over this at a red light is a traffic violation, so make sure to pay attention to those light timers!

Zebra crossing

This box indicates the part of the intersection that must--by law--be kept open at all times. Even if you have a green light, if the traffic is stopped on the other side ahead

The yellow box

Is the observation that adding one or more roads to a road network can slow down overall traffic flow through it.

Braess' Paradox

A german mathematician who postulated the Braess' Paradox

Dietrich Braess

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