It was in the early 1970’s that the idea of spraying thermoplastic road markings first took off in the UK. The first machines were quite large and unsuitable for urban streets. Smaller machines that could manoeuvre around tight corners and apply yellow lines were needed.
Not satisfied with the machines then available from machinery manufacturers Wilson & Scott decided to make their own machine for use on their UK contracts.
From an earlier articulated version called PS/3 the highly successful PS/4 emerged. With a triangle style wheelbase and its spray guns aligned with the front axle the PS/4 could navigate tight radii and narrow streets to lay double yellow lines simultaneously. Originally planned only for use in-house at WS a demand from other UK and Irish contractors led to the establishment of a production line and the eventual manufacture of more than 120 machines. They were sold across the world with 50 going to the USA alone.
Production ceased in the late 1980’s but these simple robust machines kept working and continued to be used regularly for more than 30 years. With its oldest machines now beyond repair WS decided to resurrect the concept of the PS/4 using the latest technology and industrial design standards. The new PS/4 hit the roads in March 2020.