Following distance — memorize this exactly Illinois CDL uses a heavy-vehicle formula, not simply the regular-car 3-second rule: At speeds UNDER 40 mph: 1 second for every 10 feet of vehicle length. At speeds OVER 40 mph: Use the same formula PLUS 1 additional second. Vehicle length Under 40 mph Over 40 mph 30 ft 3 sec 4 sec 40 ft 4 sec 5 sec 50 ft 5 sec 6 sec 60 ft 6 sec 7 sec You’re driving a 40-foot bus at 35 mph. How much following distance? ➡️ 4 seconds. 40-foot bus at 50 mph? ➡️ 5 seconds. And if the road is slippery, Illinois says you need more space to stop, so increase your following distance. 🚗 If someone is tailgating YOU Illinois says: * Don’t speed up. * Avoid quick changes. * If you need to slow/turn, signal early and reduce speed gradually. * Increase your following distance so you don’t have to make sudden changes. * Don’t try to “teach” the person behind you a lesson by flashing your brake lights or doing tricks. 🛑 And here’s an important stopping-distance number For an air-brake vehicle traveling 55 mph on dry pavement, the manual says air-brake lag adds about 32 feet, and total stopping distance for an average driver under good conditions is over 450 feet. The manual’s example gives 451 feet at 55 mph. ⸻ And YES, this is exactly how I should make the rest of your study sheet: not “drive carefully,” but the actual numbers/rules you’ll need to recognize on the test. The manual asks: How far ahead should you look? ➡️ 12–15 seconds ahead. At highway speed, that is roughly one block in the city or about ¼ mile on the highway. You should look for: * Traffic * Pedestrians * Road conditions * Traffic signals/signs * Vehicles entering your path * Other hazards 🚗 Following distance For a large vehicle: Under 40 mph: ➡️ 1 second for every 10 feet of vehicle length. Over 40 mph: ➡️ Add 1 additional second. Example: 40-foot bus at 35 mph = 4 seconds 40-foot bus at 50 mph = 5 seconds This is one you should MEMORIZE. 🛑 Stopping distance The manual breaks stopping distance into: Perception distance + reaction distance + brake lag + braking distance = total stopping distance. At 55 mph, the Illinois manual’s example gives: * Perception: 142 ft * Reaction: 61 ft * Air-brake lag: 32 ft * Braking: 216 ft * Total = 451 ft That’s under good traction/braking conditions for the example. ⚠️ Speed There isn’t a rule like “always reduce to 20 mph when visibility is X.” Instead, the manual says you must choose a speed that is safe for: * Your vehicle * Road conditions * Weather * Traffic * Visibility * Curves * Grade For downgrades, never exceed a posted speed limit or a posted Maximum Safe Speed. Use the engine’s braking effect as the principal way of controlling speed and select a low gear before starting down the grade. 🌧️ Bad weather / visibility Reduce speed for adverse weather or road conditions. In work zones, the manual specifically says to: * Obey the posted work-zone speed limit. * Watch your speedometer. * Reduce speed for bad weather/road conditions. * Reduce it even further when a worker is close to the roadway. So don’t memorize a made-up “visibility = X mph” rule—the Illinois CDL manual does not give you one universal number. ⸻ SECTION 3 — TRANSPORTING CARGO ⚖️ Class B 26,001+ GVWR = Class B. A Class B vehicle can tow a vehicle with a GVWR of 10,000 lbs or less. Cargo Remember: Cargo must be secured so it cannot: * Shift * Fall * Leak * Affect vehicle control For your bus, this mostly translates into knowing how passengers/baggage and any other carried items must be kept secure. ⸻ SECTION 4 — PASSENGER For your bus goal, study this heavily. 🚍 CDL passenger threshold A vehicle designed to transport 16 or more people, including the driver, requires a CDL. Passenger endorsement For Illinois Class B: Passenger (P) = Section 4. Illinois lists Passenger as an optional endorsement for Class B and C, with written and skills/drive testing. Know: * Passenger loading/unloading * Emergency exits * Aisles * Seating * Baggage * Doors * Evacuation * Passenger safety * Railroad crossings ⸻ SECTION 5 — AIR BRAKES Since you’re going for the bus route, I would learn these numbers. 💨 Air pressure Before driving a vehicle with a dual air system: ➡️ Build air pressure to at least 100 psi in BOTH systems. 🚨 Low-air warning The warning light/buzzer must come on before air pressure drops below 60 psi in either system. If that happens while driving: ➡️ Stop immediately and safely park. Those are very important numbers. 🛑 Air-brake lag At 55 mph on dry pavement: ➡️ Air-brake lag adds approximately 32 feet. Total stopping distance in the manual’s example: ➡️ 451 feet. ⛰️ Long downgrade braking Once you’re in the proper low gear: 1. Apply brakes enough to feel a definite slowdown. 2. When you’re about 5 mph below your safe speed, release the brakes. 3. That application should last about 3 seconds. 4. When speed rises back to your safe speed, repeat. 🔥 5 mph + 3 seconds = memorize it. ABS ABS does NOT mean: * Drive faster ❌ * Follow closer ❌ * Drive less carefully ❌ It helps maintain control and prevent brake-induced wheel lockup. It does not necessarily shorten stopping distance. ⸻ SECTION 10 — SCHOOL BUS 🚌 Since you’re actually driving school buses, this section matters a lot. 🚨 Danger zone The school-bus danger zone can extend: Up to 30 feet in front of the bus. The first 10 feet in front is the most dangerous. Also: 10 feet to the left 10 feet to the right 10 feet behind the rear bumper And the left side is always considered dangerous because of passing traffic. 👀 Mirrors The Illinois manual’s diagram shows: 200 feet of coverage to each side in the mirror illustration. It also notes that a blind spot can be approximately: 50–150 feet. 🔥 Those numbers are worth memorizing. School Bus endorsement Illinois requires: P + S for a CDL driver operating a yellow school bus to transport school students. The S endorsement requires: * Passenger written test * School Bus written test * Skills/drive testing in the proper school bus And an Illinois School Bus Permit (SBP) is also required for school transportation covered by the state rules. ⸻ SECTION 11 — CHARTER BUS Here’s something important because you told me they specifically told you to study 10–14. Illinois has a Charter Bus (C) endorsement. But it has a very specific purpose: a bus other than a school bus that is chartered by a school to transport students in grade 12 or below to/from a school-sponsored activity. So for studying, focus on: * Passenger safety * Loading/unloading * Emergency exits * Baggage * Emergency procedures * Bus inspection * Passenger management But don’t confuse Charter Bus C with the regular CDL Class C license. ⸻ SECTION 12 — PRE-TRIP 🔥 THIS IS NOT JUST A WRITTEN-TEST SECTION. It’s part of your actual CDL skills testing. Illinois says the CDL drive test has: 1. Pre-trip inspection — Section 12 2. Skill maneuvers — Section 13 3. Driving road test — Section 14 For your bus, learn how to identify/check: Engine area * Leaks * Belts * Hoses * Fluid levels * Steering components Wheels/tires * Inflation * Tread * Damage * Lug nuts * Rims Suspension * Springs * Mounts * Air suspension components where equipped Brakes * Lines/hoses * Chambers * Slack adjusters * Drums/discs * Damage Lights * Headlights * Brake lights * Turn signals * Clearance/marker lights * Four-way flashers Emergency equipment * Fire extinguisher * Warning devices * Required equipment ⸻ SECTION 13 — BASIC CONTROL Your big focus: Straight-line backing Keep the vehicle straight while backing. Offset backing Move the vehicle backward while controlling the path into the required position. General rule Slow = control. Use: * Mirrors * Looking around * Steering corrections * Stop-and-check when necessary Don’t rush the maneuver. ⸻ SECTION 14 — ROAD TEST This is where they watch how you actually drive. Know how to perform: Turns * Signal * Check mirrors * Correct lane * Proper speed * Watch rear wheels Lane changes ➡️ Mirror → signal → check → move Intersections * Check traffic * Pedestrians * Signals/signs * Proper stopping position Railroad crossings * Follow the applicable passenger/school-bus procedure. Stopping * Controlled * Smooth * Complete * Correct location Speed * Never exceed the posted limit. * Adjust speed for conditions. ⸻ ⭐ YOUR NUMBERS TO MEMORIZE Put this somewhere you can look at it every day: Topic Number Class B 26,001+ GVWR Class B towing 10,000 lb or less Following distance 1 sec / 10 ft under 40 mph Over 40 mph +1 second Look ahead 12–15 seconds Air system before driving 100 psi minimum Low-air warning Before 60 psi Air-brake lag @ 55 mph 32 ft Total stopping example @ 55 mph 451 ft Downgrade braking cycle 5 mph below safe speed / ~3 sec School-bus danger zone front up to 30 ft Front most-dangerous area first 10 ft School-bus side danger zones 10 ft each side School-bus rear danger zone 10 ft Mirror diagram side coverage 200 ft Possible blind spot 50–150 ft Passenger CDL threshold 16+ including driver