## 4 Results and Discussion
In the case of maintenance with 3.000 ped/h, the obstruction caused by the area without access generates a reduction in speed due to the high density. Instead, in the cases of standard/normal (daily) conditions with 1.500 and 3.000 ped/h, there are speeds between 0.9 and 1.1 m/s as well as in the case of handling with 1.500 ped/h. The scenario with 3.000 ped/h represents standard conditions with constant value along the entire bridge. This value owes to the massing of people during the exit from the area subject to some problem or disaster. In terms of density, there is an increase in the value in the case of a scenario with 3.000 ped/h with maintenance activity scenario as the space of possible movement is halved and the flow is at a maximum especially along the two ramps as described in Figure 5.  
The images below allow visualization of the cases analyzed considering the superimposition of an orthophoto with the areas implemented for the pedestrian simulation. It also shows how the geometry is taken into analysis considers an extension of about 30 m with two days with a slope of about 10-12% characterized by a surface with steps. Each scenario is characterized by the presence or lack of an inaccessible area linked to maintenance activities. Appropriate ranges of values have been selected to be able to chart the variability of the ramp service level and in the previous and subsequent areas. In particular, the results produced by the results made by the simulations mean that the LOS results of the investigated area are equal to the values shown in Table 8.  
In the areas and ramps characterizing the monitored track, a range of speeds of 0.308 m/s was evaluated, characterized by cold blue tones in the images to follow up to 2.7 m/s characterized by warm red tones. Therefore, in Table 8, it is denoted that a fluid and constant flow is characterized by high speeds and warm colors and that this concept becomes critical in some scenario conditions where speeds are reduced almost to block the flow. In the first scenario, there is a variability of the speeds both in the access areas and in the ramps between 1.07 m/s and the maximum admissible speed value \(>\)2.1 m/s. This value increases by 10-15% in the ramps compared to the areas. Scenario 1 is linked to a daily good fluidity of the pedestrian outflow. In scenario 2, the doubling of the flow leads to a reduction of the speed in the ascending west \begin{table}
\begin{tabular}{c c c} \hline \hline \multirow{2}{*}{**LOS**} & **Max RAMP Speed** & **Max AREA Speed** \\  & **(km/h)** & **(km/h)** \\ \hline A & \textgreater{}2.7 & \textgreater{}2.153 \\ B & 2.7 & 2.153 \\ C & 1.53 & 1.076 \\ D & 1.076 & 0.718 \\ E & 0.718 & 0.431 \\ F & 0.538 & 0.308 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: LOS range related to RAMP and AREA. ramp compared to the east descent ramp, instead, the access and exit speeds to the terminal areas are reduced by 5-7% with respect to the first scenario. The evacuation scenario 3 with 1.650 ped/h shows a velocity \(<\)1.1 m/s in the west area where people are destined to take shelter while in the area of the East to which the motion is inhibited, it is characterized by a faster speed. The high values of an entering and exiting flow in the first area drastically reduce the speed of the area W. The ramp W also has a speed half of the ramp E as long as there is a chaotic mass of people evacuating from the first of the two. They performed to identify differences between the average walking speeds of single walker (1.00 m/s, \(\pm\)0.07) and groups (0.89 m/s, \(\pm\)0.01). To compare the results obtained in the various scenarios, the pedestrian and done speed range of LOS were modulated both in the areas and in the ramps as shown in Table 8 below. To better understand the value of LOS related to the monitored infrastructure, it has been hypothesized to divide the ramps and the n areas, in both directions as shown in Figure 6. Likewise, the simulation and evaluation of service levels have been carried out for each defined section.