Show Record of Bumps Per Mile Are Registered Records of or th the number of bumps In a mile of road aro are now being kept by the tho Minnesota highway department according to a 1 recent bulletin The record records s Is I being made with a a de- de device de device vice attach attached to an automobile In such a manner that when hen the car strikes a bump which depress depress- depresses es I es the Iho front springs s one Inch one on point Is la recorded on the tho th dial of the Instrument panel Bumps may moty record from one thirty second of ofa ofa II a point to two or three points ponts according ac- ac according cording to size sire On a 1 recent test teat run made by byO O 0 I I Kipp KipI construction engineer of the department and nd F C IAn Lang en engineer of tests one OTIC piece of pavement la was found on which h 58 points point worn were recorded This however had been built before the state trunk highways system I Iwas was established and has hili c carried thousand vehicles a II day for several years ear The minimum on pavement was 66 6 points In- In Ina in-a In-amile In a 1 01 mile and most mo t of the tho pavements built by hy the state showed from front 80 to J ISO 60 points a II mile Some Rome of thIs was wag a on new nW construction where the joints had not noC y yet t been smoother down The minimum on gravel orn was 1 poInts and the tho maximum recorded was but the tho latter was w-s on ona ona ona a road so o rough that It ft w was a necessary necessary essary canTY to 11 slow Klow down and dodge rou I holes hotel A much higher record would have Javo been made If the average a speed of 35 IS mile miles an anthe hour had I been oen en ax nil and the done don on the pavements the better beUer gravel gravet roads On well well- maintained and recently leveled gravel road roads th the points point per mile Usually ran from ISO to rn fn The Tho record confirms too the pop pop- ular popular that some Home of our gravel road roads are smooth a as pave pave- ment pavement C I Dab Bab- Babcock cock Bab-cock cock sal said l itIs ItI The only trouble ID Is I that It I Is Impossible to maintain that sur- sur sur face faco surface In all II kinds kind of weather or un un- un der under heavy traffic We e have ha-e some gravel roads that cost us ua mOre than 2000 a II mile a year y r for maintenance O and still their con con- eon con condition Is Ij tar far from good The abundance of travel gravel In Minnesota however has ha made mado t I possible to get the tho sla sta out of tho mud year years ahead of some of our neigh for states |