Years ago, I occasionally commuted by motorcycle. In some ways it was a lot like bicycle commuting. I was the little guy, and very vulnerable without the protection of a steel cage, air bags, or seat belts. At times I felt like nobody even saw me! This vulnerability was accompanied by high speeds on the highway, and being part of traffic in the city. Although my motorcycle commuting days didn’t last that long, I learned some valuable traffic skills that I still use when cycling on the road. I took a weekend long motorcycle safety class, and one thing they stressed heavily was the SIPDE Process. As we ride through the city, there are hundreds of things going on around us. In a single city block there may be pot holes, car doors opening, pedestrians crossing the street, traffic from the rear, and traffic exiting parking lots. The SIPDE process helps you deal with the unpredictable nature of urban cycling. Here’s the breakdown of the SIPDE acronym:
As cyclists, we have better than average motor skills than most, so naturally we do a pretty good job with the Decide and Execute parts of SIPDE. Where we run into trouble is the Scan, Identify and Predict portions. These are skills that take experience, practice, and constant attention. Just in the last couple months, there have been a couple of tragic cyclist deaths involving very large trucks turning right into the cyclist’s path. Unfortunately it was too late for Decide and Execute for these people when the accidents occurred. It’s possible that better Scanning, Identifying, and Predicting may have saved their lives. Since we cyclists are so vulnerable, we must never take for granted the actions of those around us. Never assume that cars are going to follow the rules or properly signal their direction. Sometimes people just change their minds at the last second. Use your SIPDE, and stay safe on your commute! Driving includes a few tasks: controlling the car, watching the road for other drivers, hazards and understanding the signs and signals to make decisions. You need to drive defensively to protect yourself and prevent collisions. Your vision is crucial for driving and it’s very dangerous for everyone if you’re not looking at where you’re driving and at the obstacles around you. You can avoid this by constantly scanning the road for hazards and other vehicles. One of the most popular methods is the Smith System of SIPDE. This refers to:
When scanning the road, look at least 15-20 seconds ahead (about two blocks in the city or 1/3 mile on the freeway). If you don’t look far enough ahead, you will overlook any hazards that may be coming your way. Also, check the vehicles behind you every 5-7 seconds. You must constantly adjust as traffic conditions evolve to avoid dangerous situations. Scanning ahead helps to ensure your path of travel is safe and allows you to spot potential hazards ahead of you to adjust your speed. Slow down if your view ahead is blocked because you will not be able to adjust otherwise. When changing lanes, look for a wide enough gap to maneuver into without forcing others to slow down. When scanning the road, watch for hazards or indications of hazards such as car slowing down, lane blockages or vehicles suddenly going faster or slower. These can happen at any time so you’ll need to be able to predict what may happen. If there’s a long line of cars approaching from the opposite direction, you will need to slow down and be prepared to brake and move to the right. When approaching a curve, slow down before entering and stay towards the right of the lane. [2] You need to check your blind spots and avoid lingering in other driver’s blind spots. Blind spots are shown in the picture below. Vehicles can be completely overlooked if they are in your blind spot and it is especially easy to overlook motorcycles. You can use your rear-view mirror and side mirrors to check your blind spots by scanning every 5-8 seconds and when you want to change lanes. This will help you adjust to the ever-changing traffic conditions. You need to turn your head in order to see in your blind spots because the mirrors cannot see into the blind spots. There is some newer vehicle with blind spot alerts built into your side mirror but it is still good practice to check your blind spots by turning your head. Make sure your mirrors are positioned correctly if you are checking them. If positioned correctly, it will account for most of your blind spots. Your mirrors must be set from your normal position on the driver’s seat. [3] Blind spots are an issue when backing up. There may be debris to the rear that can damage your car or a passing vehicle or young children may be behind your vehicle. According to KidsAndCars.org, every week there are 50 children backed over in the US because a driver could not see them. Over 60% of the back overs involved large vehicles (truck, van, SUV). Most drivers are unaware of the large and dangerous blind zone that’s behind their vehicles and children do not understand the dangers of slow-moving vehicles. Majority of the back over victims are one year old and children younger than 5 are most at risk. An average of 232 fatalities and 13000 injuries occur every year due to back overs. Drivers can heighten their awareness before engaging a vehicle in reverse especially when children are present. Young children are impulsive and unpredictable and have a very poor judgment of danger. Safety/Prevention Tips include:
Maintain a space cushion around your vehicle and increase your following distance if you want to avoid crashes. Scanning ahead will help you to know if it is safe for you to move into a lane or your left or right. You’ll need a large cushion at higher speeds so always try to maintain a 2-second rule. This rule refers to how much time ahead of you is needed for a safe distance cushion. This is the minimum recommended following distance. To establish a 2-second rule, pick an object on the side of the road such as a tree or a sign and wait for the vehicle in front of you to pass that point and count “one-thousand-one, one-thousand-two”. If you pass that point before you finish counting then you are following too closely. You may need to establish a 3 second or 4-second following distance under the following situations:
To ensure you establish a safe following distance, make sure you look ahead and around your vehicle as well as the one ahead of you. Check your mirrors, speed, and the road regularly. [4] A rear-end collision is common at intersections but may also result from tailgating. It’s no fun to get into an accident and rear-end collisions are always preventable. If you are following these 10 tips, then you can greatly reduce your chance of getting into a rear-end accident.
The stopping distance is dependant on the speed you travel. The greater your speed, the longer it’ll take to stop. Other factors that affect stopping distance include rain or snow, and slick on the road and how worn out your brakes and tires are. The 3 factors that influence your total stopping distance are perception, reaction time and braking. Your perception time is the time it takes for you to see and recognize a hazard. During ideal conditions, it will take an average driver 0.75 seconds to perceive danger. If you’re traveling at 40 mph or 60ft per second, you will have traveled 45 feet in 0.75 seconds. The distance you’ve traveled before you perceive a potential danger is called your perception distance. Your vision and level of alertness will also affect your perception time. For example: if you’re texting and driving, your perception distance will be much greater and your chances of getting into an accident will be higher. Braking distance is the distance it takes for your vehicle to stop after you press the brake pedal. The condition of the brakes, tires, weight of vehicle and road condition will affect your braking distance. For example, at 40 mph, it can take your vehicle 72 feet to stop after applying the brakes, when you double your speed to 80 mph, it will take you 288 feet to stop after applying the brakes, which is 4 times as much. The total stopping distance of your vehicle is the sum of the 3 distances (perception distance, reaction distance, and braking distance) [6] Here are some examples of stopping distance.
The total stopping distance will be affected by the conditions of the road and you can reduce your stopping distance by covering your brakes. This is putting your feet over your brakes when you are not accelerating. This will cut down your stopping distance by up to 0.75 seconds. You should do this when you are noticing a potential danger or know you may need to stop. Prepare to slow down and stop when you are approaching the following areas:
You need to slow down when entering a posted school zone where children are present. This refers to 30 minutes before, during and 30 minutes after children begin arriving at the school for the beginning or the day all the way until they start leaving school at the end of the day. You’ll find the greatest number of children outside the school grounds at the beginning and the end of a school day but you should slow down at other times during the day. When you’re entering a construction zone, you are required to yield the right-of-way to works that are present in the area. In 2013, there were 75 fatalities, 4422 injuries and 7519 work zone crashes in Florida. This has decreased since 2005 but it’s still too high! [7] Pay attention to signs that warn you of construction zones ahead of time and slow down. These signs have an orange background and they protect both the workers and the driver. You should be aware of the following when entering a construction zone:
Make sure you are aware of the speed of your vehicle and scan the road for hazards. Maintaining a proper following distance will allow you to stop safely. You can also improve your stopping distance by covering your brakes.
|