Directions: Solve the problem
21. Lian drove his car with an average speed of 60 km/h for 2 hours in the morning and
has an average speed of 70 km/h for 3 hours in the afternoon. What was the average
speed of his journey?
22. Kyler and his friend took 4-hour bicycle trip. In all, they traveled 150 km. What was
their average rate of speed?
23. A jeep travels at a speed of 32 kilometers per hour. How long will it take to travel a
distance of 96 kilometers?
24. Daniel draws a circle inside a square piece of paper whose area is 144 cm2. He
makes sure that the circle touches each side of the square. What is the area of the
circle?
25. Luigi is lying a carpet of the rectangular room. The length of the floor is 9m by 6m.
The boarder around the carpet is 1m wide. Find the area of the floor not covered by the
carpet?
Answers
Step-by-step explanation:
Schoolbus driver performance can be improved with driver training, safety incentivisation, and vehicle roadworthy modifications
Directory of Open Access Journals (Sweden)
A van Niekerk
2017-03-01
Full Text Available In South Africa (SA, the school transport industry provides millions of children with a means of travelling to and from school. The industry has, however, been reported to be plagued by widespread safety concerns. The consequent road traffic incidents have often been attributed to driver factors, including driving in excess of legal speeds or at inappropriate speeds; driving while under the influence of alcohol, while sleepy or fatigued; or driving without using protective equipment for vehicle occupants. There are currently very few SA interventions that specifically target this important industry role-player. The Safe Travel to School Programme was recently implemented by a national child safety agency, with a focus on driver road safety awareness, defensive driver training, eye- testing, vehicle roadworthy inspections with selected upgrades, incentives for safe performance, and implementation of a vehicle telematics tracking system with regular, individual driving behaviour information updates. This quasi-experimental study offers an evaluation of the initial impact on safety performance of this telematics-based driver and vehicle safety intervention in terms of speeding, acceleration, braking, cornering, and time-of-day driving, and compares the school transport driver performance with that of general motorists. Despite concerns that some school transport vehicles are used for multiple purposes outside of school transport duties, at night, and for longer distances, overall these vehicles recorded lower percentages of speeding, lower harsh braking, and lower average harsh cornering and acceleration than general drivers.
Driver perceptions of the safety implications of quiet electric vehicles.
Science.gov (United States)
Cocron, Peter; Krems, Josef F
2013-09-01
Previous research on the safety implications of quiet electric vehicles (EVs) has mostly focused on pedestrians' acoustic perception of EVs, and suggests that EVs are more difficult for pedestrians to hear and, therefore, compromise traffic safety. The two German field studies presented here examine the experiences of 70 drivers with low noise emissions of EVs and the drivers' long-term evaluation of the issue. Participants were surveyed via interviews and questionnaires before driving an EV for the first time, after 3 months of driving, and in the first study, again after 6 months. Based on participants' reports, a catalogue of safety-relevant incidents was composed in Study 1. The catalogue revealed that low noise-related critical incidents only rarely occur, and mostly take place in low-speed environments. The degree of hazard related to these incidents was rated as low to medium. In Study 1, driver concern for vulnerable road users as a result of low noise diminished with increasing driving experience, while perceived comfort due to this feature increased. These results were replicated in Study 2. In the second study, it was additionally examined, if drivers adjust their perceived risk of harming other road users over time. Results show that the affective assessment of risk also decreased with increased driving experience. Based on individual experience, drivers adjust their evaluation of noise-related hazards, suggesting that dangers associated with low noise emissions might be less significant than previously expected. Copyright © 2013 Elsevier Ltd. All rights reserved.
ADVANCED DRIVER SAFETY SUPPORT SYSTEMS FOR THE URBAN TYPE VEHICLE
Directory of Open Access Journals (Sweden)