This command generates a list with the maximum visibility reached in each station along a horizontal alignment, using the digital model. This involves selecting a segment as an entry file.
This visibility list is calculated in accordance with visibility tables defined for the regulations of each country. In the event this table does not exist in the country selected, the calculation is conducted in accordance with the speed of the vehicle, the friction coefficient and the perception / reaction time. Consult the Customization Manual to locate the visibility table files.
Speed: The speed of the project.
Category: The regulation of the country for which the calculation is to be conducted.
Initial Station: The initial station for which the calculation is conducted.
Final Station: The final station for which the calculation is conducted.
Interval: The calculation interval.
In addition to the initial and final stations and the Interval for the list, the Height of the observer and the adjustment with respect to the horizontal alignment must be indicated. The default values are those established in the Road Policy. The user may also select whether to calculate the direction of the horizontal alignment’s advance as Forward or Backward.
Once the dialog box options are validated a report is displayed on-screen, showing the current visibility for each Station, calculated from the intersections with the digital terrain model and the stopping visibility. Stopping Visibility is considered the distance along the length of a lane road that exists between an obstacle on the roadway and the position of a vehicle circulating toward said obstacle, in the absence of intermediate vehicles, at the moment at which the obstacle can be discerned and does not disappear from sight until reaching it.
At the bottom of the report the Takeover distance is displayed, defined as the distance necessary for a vehicle to overtake another driving at a lower speed, in the presence of a third vehicle coming from the opposite direction.
It also displays the light crossing distance for light, heavy and articulated vehicles. Light crossing distance is considered the crossing distance a driver needs to see to be able to cross another road with an intersecting trajectory, measured along the horizontal alignment of the lane road.
TcpMDT
