foundation pad 29 is utilized at any particular trouble spot it is likely that two or more of the pads may be connected together to form a series in the wheel track thus each pad 29 is provided with interlock structure broadly denoted by the numeral 42 and including one or more male components 44 at one end and a corresponding one or more female components 46 at the opposite end 40 in a preferred embodiment as illustrated in the figures a pair of male components 44 and a pair of female components 46 are provided at opposite ends each male component 44 is in the nature of a hook having a generally outwardly and longitudinally projecting top leg 48 and a downturned tang 50 at the outer end of leg 48 top leg 48 is slightly offset upwardly from the remaining body of pad 29 which helps to create an angled recess 52 below leg 48 and rearwardly of tang 50 in addition the male component 44 includes a keeper lip 54 that projects axially outwardly from the lower end of tang 50 for use in keeping male component 44 releasably locked within a corresponding female component 46 each female component 46 includes an opening 56 configured complementally to a male component 44 for the purpose of releasably receiving and retaining component 44 when a pair of the pads 29 are interlocked end.