From http://www.gov.je/news/2017/pages/saferoutestoschools.aspx

“Traffic calming will be installed later in the summer on Pontorson Lane, Rue de la Croix and Rue de Maupertuis to provide a route from Le Squez.”
…
“The traffic calming includes the installation of raised tables on
▪︎Samares Lane at the junction with Rue de Maupertuis and Rue de la Croix
▪︎Pontorson Lane at the junction of Rue de la Croix and Rue de la Chapelle
▪︎Pontorson Lane between the junction and the new school path”
…
“… closing Rue de Maupertuis to through traffic at the double bends.”

So, there's more to add, and a survey will be needed given the (small) nature of several features. Sensible, too, since these changes affect routing.