used to honor officers. somewhere beneath the cards and the flowers, dallas police cruisers. the week's deadly shootings have had an impact on everybody. >> you know how close that could have been to me. >> reporter: even the youngest members of the community are learning about loss. with a bucket nearly bigger than he is, 6-year-old charlie argo from burlington, texas has set out to help. with cookies, lemonade, and kool-aid, he's learning the value of a dollar for a greater cause. he told his mom whatever profit he made he'd donate. >> to help the families of the police. >> reporter: to charlie big cookies mean big bucks. and big hearts. >> 25 years as a volunteer fireman. thank you. >> reporter: working in the texas heat is hard work. >> i'm tired of standing. >> reporter: and doing good can charlie tell you. >> it's -- it takes forever. >> reporter: if you couldn't tell by his kool-aid mustache or the chocolate on his face, he's dipped into his profits a bit. but he's made up for it. the innocent know what's happened, and they're hurting too. and whether it's with a cold drink or flowers, today in dallas it's about paying tribute to the fallen. in dallas, texas, erika gonzalez, news 4. >> the events in dallas happened after several police-involved shootings across the country. many people in our area are trying to find the words to explain all of this to their children. prince george's county bureau chief tracy wilkins talked to several parents about the conversations they're having. >> reporter: when video surfaced on social media of the two recent police confrontations that ended in death in baton rouge, louisiana and falcon heights, minnesota it once again sparked a painful and difficult conversation my son a lesson on how to survive a traffic stop alive. nobody should have to go through that. >> reporter: today we spoke with members of the 100 black men of prince george's county, a teen mentoring group, about what they're telling their young members about encounters with police. >> when you're being arrested, that's not the time for you to argue your innocence or guilt. that's for the courts, the prosecutor, the defense attorneys. >> you cannot appear to be combative, threatening, or condescending. >> we teach these things to our children every day. how to talk to adults. but it's a different level when you are -- you encounter law enforcement. >> it's a reality that's difficult for these men to explain. many of whom are fathers themselves. >> i'm a big black man. so the threat is real. so we have to teach our children that be shows a man dying moments after he was shot on facebook live. the baton rouge video shows a man shot point blank range while restrained by two officers. while there are still details to be learned, parents are discussing how to protect their own from the same ending. tra tracee wilkins, news 4. metro's safe track program is under way. no trains were run between reagan national airport in pentagon city and the crystal city station is closed. as usual, shuttle buses will replace trains. but riders traveling from the south should get off at braddock road to take the shuttle bus. only people needing to go to reagan national should ride all the way to that stop. phase 4 ends july 18th. it is summer. it is construction season. and that means slower commutes around our area. this year there are three projects you need to watch out for. transportation reporter adam tuss shows you what areas to avoid. >> reporter: when this tangled web of roadw your car sit. >> it's a little bit of a mess, yes. >> reporter: one problem spot, river road between goldsboro road and the d.c. line. repaving project happening now. it comes on the heels of massive utility work here. >> i don't know whether it's been utilities, water, or electricity or cable down below, but obviously something they had to do. >> reporter: and this new repaving project won't finish up until next year. 31,000 vehicles a day impacted by the work, which is often happening midday. >> it's just been more convenient for everybody if they do it at night. i don't understand. it doesn't make sense. >> reporter: now, in the district you can't miss the twisting, turning work around 3rd street and massachusetts avenue in northwest. a new tunnel here and utilities being moved next to major development. it means even walking through here is tough. >> it's a little stressful. >> what was it like trying to cross the street here? it's difficult, right? >> yeah. a little bit. >> reporter: and beltway a new project to add electronic tolling systems will start next month. this project will change 66 inside the beltway. for the first time solo drivers will be allowed to pay to use the road during rush hours. adam tuss, news 4. when "news 4 this week" comes right back, a unique way volunteers and veterans are paying tribute to the nation's fallen heroes. and what these local students are learning about patient safety and how it may save hundreds of thousands of lives each year. ♪ they call it renewal and remembrance. hundreds of professional landscapers recently volunteered their services at arlington national cemetery. they worked on the cemetery's grass, plants, and even the irrigation system. many of the volunteers are veterans who want to pay tribute to the nation's fallen heroes. >> there's a peacefulness. there is that when you're sitting in front of that grave and you're letting that individual know that they are not forgotten. >> this as the 20th anniversary of the renewal and remembrance project. it is organized by the national association of landscape professionals. smokeless tobacco could be a thing of the past at nationals park. the d.c. council is considering a law that would ban stuff at d.c. sports venues. it's already been banned in new york city and four other major cities. nationals manager dusty baker has been in the game for decades and he sounds like he's in favor of this move. >> in the past i've used smokeless tobacco. you know, whatever they decide, i think it's for the best for the kids and best for the guys that are using it. and it is very addictive. >> major league baseball is trying to implement a leaguewide ban. but the players union is resisting. the d.c. council is expected to schedule a vote later this year. next on "news 4 you won't believe how many people die every year from things like surgical mistakes, prescription errors, and misdiagnosis. improving safety and generating revenue. a look at the speed camera debate in the district as we learn just how many millions of dollars it collects in tickets. ♪ news for your health now, and a focus on medical mistakes. a recent study found they're the third leading cause of death across the country. as news 4's doreen gentzler found out, some doctors and hospitals are working to change that. >> reporter: you may remember the headlines from five years ago. pennsylvania congressman john murtha went into walter reed medical center for gallbladder surgery. a month later he died at virginia hospital, reportedly due to complications from a mistake made during the operation. >> if medical care gone wrong were a disease, it would rank as the third leading cause of death in the united states. >> reporter: dr. marty mc recent study which analyzed death rate data from the past eight years. the results, published in the journal "bmj," put death from medical errors just behind heart disease and cancer as the leading causes of death in this country. >> unnecessary treatments, fragmented care, people falling through the cracks, overdoses, complications that are totally preventable. these are the collective causes that comprise the problem of people dying when they should not. people dying under our care. >> reporter: dr. mccarey underscores that most of the mistakes are not due to inherently bad doctors. >> and we shouldn't look to doctors to blame the problem on individuals. we are human, and we're always going to be human. but we can talk about how can we design the system in the hospital so capture mistakes, provide safety nets. >> reporter: early on a monday morning in downtown washington, dozens of new medical interns are given by medstar health. >> our job is to give you these tools, to train you in these so that you can provide the safest, highest-quality care possible. >> reporter: dr. david mayer runs the three-day seminar. >> we need to break down those barriers. we need to do huddles with everybody involved with a person's care. >> reporter: he cites miscommunication and diagnostic error as significant causes of medical mistakes, and he believes educating and supporting young doctors is critical. >> we've got to make sure that they understand that it's safe for them to go up the chain of command, to call a senior zrentzrent resident, to call an attending when they're uncertain and they're trying to make a critical thought process in a patient's care. >> reporter: while dr. mccarey hopes more funds will be directed toward combating medical error for the long term. >> we spend a lot of time and money on heart disease and a lot of time and money on cancer, but we have yet to rog our complex medical system can harm people just as any diagnosis or medical treatment can go wrong. >> reporter: doreen gentzler, news 4. this week aaa issued a warning for drivers in the district. the number of tickets issued from those speed cameras is headed up. news 4's tom sherwood has a look at just how many tickets are being handed out. >> reporter: every day thousands of cars and vehicles travel through the nation's capital, and every day speed cameras catch thousands of those vehicles dangerously exceeding the speed limit on major streets and through residential neighborhoods. now aaa, the auto club and insurance company, is warning motorists that after a drop-off in ticket funds in the district three years ago they're rising again. >> the ticket prices are too high. the ticket price is quadruple the ticket price in maryland. and people don't understand that. >> reporter: in fiscal year 2015 last year the city wrote a total of about tickets, according to aaa's review of city records, and collected $55.3 million in fines recorded paid that year. and through the first six months of this fiscal year there were 365,000 tickets and recorded fines of $37.4 million, a pace that could exceed last year. >> you've done your latest report on speed cameras. what's the basic thing you really want motorists and people to know? >> to obey the speed limit, to slow down. and there's a harsh penalty if you don't. we'd like to see more compliance and a change in the ticket amount in the district of columbia. >> reporter: motorists say maybe some 25-mile-per-hour speed limits could be adjusted but many also agree cameras slow traffic and boost safety. >> the fact of the matter is speed does kill people and you do need to follow the speed. the speed limits are set for a reason, for the safety of the public. >> reporter: in the district, tom sherwood, news 4. she'll forever behe girl of the london olympic games. now gabby douglas has a chance to repeat that in rio. she officially made the u.s. women's gymnastics team this but as carol maloney shows us, the road to rio has been anything but smooth. >> 2012 women's gymnastics all-around gold medalist, gabby douglas! >> reporter: at 16 years old gabby douglas burst onto the scene. the gold shiny, the lights bright. hollywood so alluring. she considered giving up the sport. but now douglas going to rio after a rocky road back. >> right here a simple full turn. with a fall. wow. >> reporter: two falls off the balance beam this weekend at the olympic trials did not make the decision easy for team usa head coach martha karolyi. but gabby's peaks outweighed those valleys. >> that's what champions do. >> reporter: those nerves of steel paying off for douglas. the selection committee needing extra time to finalize who is on the roster. a long wait with a happy result. >> the reigning olympic all-around champion, gabrielle douglas! >> i'm just so grateful and so honored. and right now i'm just going to work so hard and put my all into it. sitting in that room is so emotional and so nerve-wracking and it's just like -- you know, everyone's worked so hard. you put everything into it and when you don't hear your name called it's like wow, is this really happening? it's just an amazing moment. nothing really could compare. the heat is on all across the dmv. temps in the 90s have taken their grip. they're not letting go. it's all when "news 4 this week" ♪ in the past few days we've had a look at some of the changes that could be happening or coming at the national air and space museum in washington. the smithsonian received approval for the designs and work is expected to start next year. the improvements will take about five years to finish. the smithsonian plans to keep sections of the museum open while the improvements are made. the long hot summer is in full swing, but that hasn't stopped people from getting out and enjoying everything our area has to offer. news 4's david culver shows us how some people are coping. >> reporter: on kayak or canoe, a calming approach into the natural space. >> the weather's perfect to go out for a paddle. just make sure you're hydrating. wear lots of sunscreen. >> reporter: these two mapping out their route through the scenic roosevelt island. >> you definitely want to make sure to stay hydrated. >> reporter: the tree cover making the heat more bearable. >> we have it's going to get hot. >> reporter: hot and sweaty. >> you've got the rag with you. >> i've been wiping myself down. >> reporter: those who have to layer up plan to perspire. >> i'm sweating right now just talking. it's pretty miserable out here right now. very humid, very hot. >> reporter: arlington county police sergeant brian morrison particularly mindful of what his partner has to deal with. >> this is canine jack, 2-year-old belgian malin ois. >> he's got a device that warns if the hot gets too warm. >> i turn it back on. that beep means it's syncing. when it's synced it will send a signal to this and it will start to page. >> reporter: a big concern as the temperatures rise, kids being left in the back of hot cars. already this year, 16 deaths reported. that's double the number from this time last year. >> even with the windows down the air circulation is not going to be enough to cool that car down. >> reporter: for jack the cruiser's not only left on. he also has access to water inside. david culver, news 4. >> could be e. that's going to do it for us for "news 4 this week." thank you so much for watching. i'm jason pugh. we're going to leave you with some pictures of people playing that crazy new pokemon go game around d.c. that's going to do it for us. have a great week, everyone. ♪ ♪ ♪ know you're budgeted for the expected, and the unexpected. know that at least the process of buying a new home can be clear and simple. know your investments can make retirement closer than you think know. the one word behind all the guidance we provide, tools we create, and services we offer. because when you have insight, you know. at 6:00 a.m., good morning. fighting for control. police battling it out in turkey with explosions and gunfire. how a country in chaos is trying to obtain a cue. >> what we are finding out about the attacker in a gunfight with police. a driver killed on a busy road. the dangerous situation as investigators piece together that wreck. a busy overnight when it comes to our international siege. we want to begin here at home. we are in for a hot and humid day. good morning, i'm