I propose that traffic lights be retrofitted to allow better use of the green wave, thereby improving the flow through junctions, reducing time loss, reducing harmful emissions, reducing fuel expenditure, reducing nervousness....
One such option is the installation of signs (traffic lights) with the recommended speed at which drivers should drive in order to reach the next green light at the next junction. Since traffic lights (at least in Ljubljana) are mostly interconnected, this would not be a major problem. As a point of interest, about 40 years ago, a similar traffic light stood behind the junction of Slovenska and Zoisova, indicating whether drivers should drive at 40, 50 or 60 km/h to get to the green light at Šubičeva. As there is no stopping and starting again, the flow is much higher.
The second option (along with the first) is to install equipment that uses sensors to identify the traffic load in certain directions and adjusts the length of the traffic light intervals accordingly. Thus, today, we often see a green light in a direction without a single vehicle, but in the cross direction there are opaque queues. Such sensors in the ground have already been installed in some places, and optical sensors could also be added to place the equipment in the busiest directions. SW would also need to be optimised accordingly.