Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 48)

T400 Controller Facilities Manual

667/EB/20200/000 Page 6-2 Issue 9

6.1.3 SDE Extension Inhibit

An SDE extension may be suppressed, but not the associated extra clearance, by using

a Special Conditioning mask. This would be used in an early cut-off situation where

the overlapped phase would not be required to be extended by its SDE loops during

the turning movement. In the example shown in section 21, Phase B SDE extensions

would be inhibited during Stage 2.

6.2 SPEED ASSESSMENT (SA)

Each traffic lane is provided with an assessor situated 151 metres from the stop line. A

vehicle crossing the assessor at a speed above 28mph (45Km/hr) generates a fixed

extension of 5.0 seconds after a delay period which is dependent on the vehicle speed.

The faster the vehicle speed the less the delay period is. Above 62mph (100Km/hr) the

delay period is zero.

See Figure 6.1(c) for a sketch of the layout.

The formula for calculating the delay period is:

Delay = (140) - 5 seconds

(V)

where V is the measured vehicle speed in metres per second. For example, the delay at

30 mph is 5.5 seconds and the delay at 45 mph is 2 seconds. During the delay period, a

normal gap change can occur.

6.3 ASSESSORS AVAILABLE

There are up to 16 assessors (0 to 15) available for use on SDE or SA.

6.4 EXTRA CLEARANCE PERIODS

Each phase which is equipped with SDE or SA can be allocated an extra clearance

period to extend the subsequent intergreen. The extra clearance period for each phase

will be introduced if any of the following conditions occur:

(a) An SDE or SA extension is active for the phase during its amber leaving state.

(b) Any speed measurement detector does not detect a vehicle during the

associated phase green period.

extension) is active for the phase when it changes from green to amber leaving.

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 307 308

Sin comentarios

Siemens EH.75M.11. Especificaciones Pagina 48