REMOTE-CONTROLLED TECHNOLOGY ASSESSMENT FOR SAFER CONSTRUCTION

Figure 39: Frequency distributions histograms of the cross-track error in following distance and accuracy tests: (a) following accuracy, (b)lane changing, (c) roundabout operation, (e) minimum turn radius, (f) U-turn [86] A 2020 study evaluated the performance of the LT and FT in different scenarios regarding car-following distance, critical lane-changing gap distance, and intersection clearance time. For car-following distance results indicated a minimum of 75 ft for a LT and 30 ft for a FT. In terms of a lane-changing gap distance, the system needs a minimum time headway of 20 seconds for a 100 ft distance between LT and Ft to perform a safe lane change. If the distance is 62

REMOTE-CONTROLLED TECHNOLOGY ASSESSMENT FOR SAFER CONSTRUCTION

Articles inside

Appendix B: Technology Transfer Workshops

Appendix A: IRISE survey

References

operated cart

Figure 38: AIPV system layout [97

accuracy tests: (a) following accuracy, (b)lane changing, (c) roundabout operation, (e) minimum turn radius, (f) U-turn [86

Figure 35: Impact testing of TMA on a tractor [89

Figure 37: AIPV system overview [95

Figure 36: Accident involving IPV of the Virginia DOT [92

Figure 33: Dielectric Maps from Joint Surveys of I-95 near Pittsfield, Maine [63

Figure 32: Joint survey [63

Figure 27: A prototype of MnDOT remotely operated rolling asphalt density meter

Figure 30: Real-time data visualization and comparison with cores [63

Figure 31: Cherryfield, Maine calibration model [63

Figure 24: Cleaned temperature profile [52

Figure 23: Examples of Pave Project ManagerTM detailed reports with temperature profiles and paver speed or time diagram [53

Figure 25: PDP instrument background principle of operation [73

Table 3: Specification recommendations for LaDOTD [48

Figure 22: On-board computer output for real time feedback [53

Figure 19: Temperature segregation identified with thermal imaging [47

Figure 6: Conduit remote inspection using (a) crawler robot (b) UAS [22

Figure 5: Marker placement with (a) manual method and (b) automated system [19

Figure 21: Infrared sensors attached to paver for real-time thermal data acquisition [52,53

Figure 20: Distress due to temperature segregation causing inadequate compaction [50

Figure 9: Infrared sensors attached to paver for real-time thermal data acquisition [26] and the latest version of IR temperature scanners [27

Figure 18: Autonomous impact protection vehicle [44

Figure 4: Example of bridge deck demolition using a remote-controlled robot [15