with narrow paved shoulders in regions with frequent freeze-thaw cycles that may result in frequent frost-heaving of the paved shoulder. US and Canadian guidelines recommend not installing rumble strips in asphalt pavement displaying cracks, to avoid excessive break-up of pavement. It is also recommended that rumble strips be inspected in summer months for cracking, potholing, water ponding, and snowplow damage. If necessary, structural problems should be repaired. If the cracks become wide enough, grass and weeds will grow in the cracks accentuating the deterioration. The centerline of highway has a pavement joint and if milled CLRS are installed over this joint they will make pavement more vulnerable to deterioration. Truckers have reported deterioration of the joint and the CLRS. Also, road salt prematurely degrades asphalt, so having it retained and concentrated in rumble strips is not desirable. Opposition and removal In February 2010, Johnson County, Kansas, considered legislation to allow buses to travel on the paved shoulder (which was rumble stripped) when traffic slows to less than . The estimated cost was between $17.6 million and $20 million, including $2.4 million to remove the already-existing rumble strips along the shoulder of I-35. The Kansas House Transportation Committee had said it would be modeled after a similar project in Minneapolis, Minnesota. Some residents living close to either newly installed lane or transverse rumble strips have complained about noise levels and were successful in having them removed at considerable expense. In 2004, the town of Chapel Hill, North Carolina, had transverse rumble strips removed as the measured noise from nighttime traffic on the rumble strips exceeded the Town's Noise Ordinance. The noise levels at the sidewalk ranged from 60 to 77 decibels, higher than the 60 decibel noise level limit in the Town's Noise Ordinance during nighttime hours. In 2005, the London borough of Bromley removed transverse rumble strips after residents complained of the excessive "machine gun fire" noise. In 2010, Reno County planned to remove rumble strips from a roundabout after residents complained about excessive noise levels. The Transportation Association of Canada and US FHWA guidelines basically specify that a width of of clear paved shoulder between the outside of the rumble strip and the edge of pavement is adequate to provide cyclists with a clear travel path. However, in situations of parked vehicle on the shoulder, debris on the shoulder, or downhill sections even with the clear path requirement, rumble