Buckinghamshire has selected sites that are "low-risk" and has added solar road studs, extra signs and road markings.
Road markings and signs are already being put in place ahead of the new limits coming into force on 8 April.
The plans, which involve the removal of road markings, traffic controls and pavements, would largely pedestrianise areas of Mount Pleasant Road.
The upgrade would include new block paving, resurfacing of the existing carriageway, new traffic signs and road markings, the council said.
To the right, some taxi drivers say they find the extra road markings confusing, especially when they fall in a bus lane - how much room should they give?
At the other 40 sites, lights will remain switched off but further improvements to signage, bollards and road markings will be made at several, before the lighting columns are removed.
But "due to the concerns locally in relation to the speed of vehicles passing the site, the applicant is willing to introduce additional measures in the form of a mound crossing and road markings in order to highlight the 30mph speed limit".
Using a series of sensors, cameras and servos the car is able to turn the steering wheel plus activate the throttle and the shifter to navigate across this stretch of road, relying on the road markings painted on the floor to both keep it driving in a straight line and to have it stop, respectfully, at the crosswalk.
When he examined the timings of his vehicle travelling over the road speed markings, he knew for certain he had not been driving too fast.
Work to replace road signs and markings and create a revised road layout on the London-bound carriageway, near Heathrow Airport, began at 2200 GMT on Monday.
The M4 eastbound, between junctions two and three, will be closed overnight for three nights from Tuesday, and again for four nights from 22 November, to continue work on road signs and markings.
Mapping nearby features, spotting road edges and lane markings, reading signs and traffic lights and identifying pedestrians is done using a combination of cameras, radar and lidar (which works like radar, but with pulses of light rather than radio waves).
About 60 schools have the Keep Clear road signs with zig zag markings, while a few others have yellow lines with loading bans or pedestrian crossings with white zig zags, the council said.
The systems basically work the same: a series of cameras, lasers or infrared sensors integrated into the car (on the back side of the rear-view mirror, in the bumper or behind the windshield, for instance) monitors lane markings in the road.
Workmen are busily patching up the neighbouring buildings and repainting markings on the newly resurfaced road.
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More than 10 of the markings are believed to have been added to Shore Road and other parts of Swanage within the last week.
Markings from where the vehicle had hit bumps in the road indicated the vehicle was travelling at "excessive speed" as it approached the bend, he told the court.
Cars that can do smaller functions, such as control a car in traffic jams, keep you inside lane markings or auto-park, are already on the road or about to come to market courtesy of Toyota, Mercedes, BMW and others.
The key to delivering semi-autonomous capability will be the integration of lane- centering technology that relies on forward-looking cameras to detect lane markings and GPS map data to detect curves and other road characteristics, said John Capp, General Motors director of Global Active Safety Electronics and Innovation.
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Though markings are thin at times, the trail is fairly easy to follow until it joins with a logging road.
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