| |
| | |
|
The requirements of traffic control devices are listed below:
- The control device should fulfill a need : Each device must have a
specific purpose for the safe and efficient operation of traffic flow.
The superfluous devices should not be used.
- It should command attention from the road users: This affects the
design of signs.
For commanding attention, proper visibility should be there.
Also the sign should be distinctive and clear.
The sign should be placed in such a way that the driver requires no extra
effort to see the sign.
- It should convey a clear, simple meaning:
Clarity and simplicity of message is essential for the driver to properly
understand the meaning in short time.
The use of color, shape and legend as codes becomes important in this regard.
The legend should be kept short and simple so that even a less educated driver
could understand the message in less time.
- Road users must respect the signs:
Respect is commanded only when the drivers are conditioned to expect that all
devices carry meaningful and important messages.
Overuse, misuse and confusing messages of devices tends the drivers to ignore
them.
- The control device should provide adequate time for proper response
from the road users:
This is again related to the design aspect of traffic control devices.
The sign boards should be placed at a distance such that the driver could see
it and gets sufficient time to respond to the situation.
For example, the STOP sign which is always placed at the stop line of the
intersection should be visible for at least one safe stopping sight distance
away from the stop line.
|
|
| | |
|
|
|
