In view of the image, what is the maximum speed at which we may travel on this one-way road with a single lane?

A)20 km/h.
B)30 km/h.
C)50 km/h.Correct
The generic speed limits on urban roads, depending on the characteristics of the carriageway, are as follows:
a) 20 km/h on roads with a single platform for carriageway and pavement.
b) 30 km/h on roads with a single lane per direction of travel.
c) 50 km/h on roads with two or more lanes per direction of travel. (40 km/h for vehicles transporting dangerous goods)
For these purposes, lanes reserved for the circulation of certain users or for the exclusive use of public transport will not be counted.
These limits may be reduced or increased by the Municipal Authority with prior specific signage. (As is the case in the image of the question, where the speed limit is increased to 50 km/h. In the absence of signage, the limit would have been 30 km/h.)
On through-roads a limit of 50 km/h is set for all types of vehicles, except for vehicles transporting dangerous goods, which will be 40 km/h. This limit may be lowered by agreement of the Municipal Authority with the owner of the road, with prior specific signage.
a) 20 km/h on roads with a single platform for carriageway and pavement.
b) 30 km/h on roads with a single lane per direction of travel.
c) 50 km/h on roads with two or more lanes per direction of travel. (40 km/h for vehicles transporting dangerous goods)
For these purposes, lanes reserved for the circulation of certain users or for the exclusive use of public transport will not be counted.
These limits may be reduced or increased by the Municipal Authority with prior specific signage. (As is the case in the image of the question, where the speed limit is increased to 50 km/h. In the absence of signage, the limit would have been 30 km/h.)
On through-roads a limit of 50 km/h is set for all types of vehicles, except for vehicles transporting dangerous goods, which will be 40 km/h. This limit may be lowered by agreement of the Municipal Authority with the owner of the road, with prior specific signage.