It's hoped the battery-powered signs will help parish councils tackle the problem of vehicles speeding through their communities.
Until now parishes concerned about speeding have been able to fund the use of a fixed, mains-powered vehicle-activate
d sign though any positive impact has been limited to just one location.
Similar to the fixed signs, the portable ones will provide a reminder to motorists to drive at an appropriate speed.
Trials in four areas of the county, including Somerby, will begin next month.
Initial trials will last up to six weeks and two sites will be used in each trial area.
Speaking at last week's Melton Highways Forum meeting, Martin O'Connor, County Hall's team manager for integrated schemes, said parish councils would have to pay for the signs but they could be moved around to different parts of a parish where there were speeding concerns.
He said: "We see this as an extension to the community speedwatch initiative. If the trials are successful the signs would be another way of allowing local communities to address concerns about speeding."
Highways forum chairman Peter Roffey said: "This initiative would empower parish councils to take action about speeding if they felt it was appropriate."
County councillor for Asfordby division Joe Orson added: "I welcome this positive initiative. I genuinely believe it will be a further aid to slowing inconsiderate drivers down."
